Attachment 360546 Details for Bug 194002 – Patch

[patch] Patch

bug-194002-20190129204127.patch (text/plain), 98.90 KB, created by Simon Fraser (smfr) on 2019-01-29 20:41:28 PST

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Creator: Simon Fraser (smfr)

Created: 2019-01-29 20:41:28 PST

Size: 98.90 KB

patch

obsolete

>Subversion Revision: 240698
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 01815ef57e0ef4a19bed7d0668e4e43118edb308..84e4a0739c87fa3665ac5f11768c3f668404416f 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,46 @@
>+2019-01-29  Simon Fraser  <simon.fraser@apple.com>
>+
>+        Add some basic geometry information to the scrolling tree
>+        https://bugs.webkit.org/show_bug.cgi?id=194002
>+        rdar://problem/47656294
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        To allow hit-testing in the scrolling tree, store a parent-relative scrollable
>+        rect in "scrolling" and "frame hosting" nodes. This is a rect whose size is the size
>+        of the scrollable area, and whose origin is relative to the parent scrolling tree node.
>+        
>+        Frame hosting nodes need this rect because they take care of the geometry offset between
>+        an iframe and its scrolling tree ancestor in the parent document.
>+        
>+        Based on a patch by FrÃ©dÃ©ric Wang in bug 172917.
>+
>+        * page/scrolling/AsyncScrollingCoordinator.cpp:
>+        (WebCore::AsyncScrollingCoordinator::setScrollingNodeGeometry):
>+        * page/scrolling/ScrollingStateFrameHostingNode.cpp:
>+        (WebCore::ScrollingStateFrameHostingNode::ScrollingStateFrameHostingNode):
>+        (WebCore::ScrollingStateFrameHostingNode::setAllPropertiesChanged):
>+        (WebCore::ScrollingStateFrameHostingNode::setParentRelativeScrollableRect):
>+        (WebCore::ScrollingStateFrameHostingNode::dumpProperties const):
>+        * page/scrolling/ScrollingStateFrameHostingNode.h:
>+        * page/scrolling/ScrollingTreeFrameHostingNode.cpp:
>+        (WebCore::ScrollingTreeFrameHostingNode::commitStateBeforeChildren):
>+        (WebCore::ScrollingTreeFrameHostingNode::dumpProperties const):
>+        * page/scrolling/ScrollingTreeFrameHostingNode.h:
>+        (WebCore::ScrollingTreeFrameHostingNode::parentRelativeScrollableRect const):
>+        * rendering/RenderLayer.h:
>+        * rendering/RenderLayerBacking.cpp:
>+        (WebCore::RenderLayerBacking::updateScrollingLayers):
>+        * rendering/RenderLayerCompositor.cpp:
>+        (WebCore::RenderLayerCompositor::computeFrameScrollingGeometry const):
>+        (WebCore::RenderLayerCompositor::computeFrameHostingGeometry const):
>+        (WebCore::RenderLayerCompositor::computeOverflowScrollingGeometry const):
>+        (WebCore::RenderLayerCompositor::updateScrollingNodeForScrollingRole):
>+        (WebCore::RenderLayerCompositor::updateScrollingNodeForFrameHostingRole):
>+        (WebCore::RenderLayerCompositor::updateScrollSnapPropertiesWithFrameView const):
>+        (WebCore::RenderLayerCompositor::updateScrollSnapPropertiesWithFrameView): Deleted.
>+        * rendering/RenderLayerCompositor.h:
>+
> 2019-01-29  Simon Fraser  <simon.fraser@apple.com>
> 
>         Add nodes to the scrolling tree in z-index order.
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index bc81a084abd693583c65dcc7ceca5679115f7842..d2454647298bddee53239829eaf077fc2503ca2b 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,15 @@
>+2019-01-29  Simon Fraser  <simon.fraser@apple.com>
>+
>+        Add some basic geometry information to the scrolling tree
>+        https://bugs.webkit.org/show_bug.cgi?id=194002
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Add a comment explaining why we don't need to encode/decode ParentRelativeScrollableRect.
>+
>+        * Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp:
>+        (ArgumentCoder<ScrollingStateFrameHostingNode>::encode):
>+
> 2019-01-29  Simon Fraser  <simon.fraser@apple.com>
> 
>         Add nodes to the scrolling tree in z-index order.
>diff --git a/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp b/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp
>index 8f12a31da23926b06b1bd8c164e2966be8b63ae8..f7d809da1c4f19129582ea14fae9a87076b00bbd 100644
>--- a/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp
>+++ b/Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp
>@@ -40,6 +40,7 @@
> #include "ScrollAnimator.h"
> #include "ScrollingConstraints.h"
> #include "ScrollingStateFixedNode.h"
>+#include "ScrollingStateFrameHostingNode.h"
> #include "ScrollingStateFrameScrollingNode.h"
> #include "ScrollingStateOverflowScrollingNode.h"
> #include "ScrollingStateStickyNode.h"
>@@ -591,25 +592,33 @@ void AsyncScrollingCoordinator::setNodeLayers(ScrollingNodeID nodeID, GraphicsLa
> 
> void AsyncScrollingCoordinator::setScrollingNodeGeometry(ScrollingNodeID nodeID, const ScrollingGeometry& scrollingGeometry)
> {
>-    auto* scrollingNode = downcast<ScrollingStateScrollingNode>(m_scrollingStateTree->stateNodeForID(nodeID));
>-    ASSERT(scrollingNode);
>-    if (!scrollingNode)
>+    auto* stateNode = m_scrollingStateTree->stateNodeForID(nodeID);
>+    ASSERT(stateNode);
>+    if (!stateNode)
>+        return;
>+
>+    if (stateNode->nodeType() == ScrollingNodeType::FrameHosting) {
>+        auto& frameHostingStateNode = downcast<ScrollingStateFrameHostingNode>(*stateNode);
>+        frameHostingStateNode.setParentRelativeScrollableRect(scrollingGeometry.parentRelativeScrollableRect);
>         return;
>+    }
>+
>+    auto& scrollingNode = downcast<ScrollingStateScrollingNode>(*stateNode);
> 
>-    scrollingNode->setParentRelativeScrollableRect(scrollingGeometry.parentRelativeScrollableRect);
>-    scrollingNode->setScrollOrigin(scrollingGeometry.scrollOrigin);
>-    scrollingNode->setScrollPosition(scrollingGeometry.scrollPosition);
>-    scrollingNode->setTotalContentsSize(scrollingGeometry.contentSize);
>-    scrollingNode->setReachableContentsSize(scrollingGeometry.reachableContentSize);
>-    scrollingNode->setScrollableAreaSize(scrollingGeometry.scrollableAreaSize);
>+    scrollingNode.setParentRelativeScrollableRect(scrollingGeometry.parentRelativeScrollableRect);
>+    scrollingNode.setScrollOrigin(scrollingGeometry.scrollOrigin);
>+    scrollingNode.setScrollPosition(scrollingGeometry.scrollPosition);
>+    scrollingNode.setTotalContentsSize(scrollingGeometry.contentSize);
>+    scrollingNode.setReachableContentsSize(scrollingGeometry.reachableContentSize);
>+    scrollingNode.setScrollableAreaSize(scrollingGeometry.scrollableAreaSize);
> 
> #if ENABLE(CSS_SCROLL_SNAP)
>     // updateScrollSnapPropertiesWithFrameView() sets these for frame scrolling nodes. FIXME: Why the difference?
>     if (is<ScrollingStateOverflowScrollingNode>(scrollingNode)) {
>-        setStateScrollingNodeSnapOffsetsAsFloat(*scrollingNode, ScrollEventAxis::Horizontal, &scrollingGeometry.horizontalSnapOffsets, &scrollingGeometry.horizontalSnapOffsetRanges, m_page->deviceScaleFactor());
>-        setStateScrollingNodeSnapOffsetsAsFloat(*scrollingNode, ScrollEventAxis::Vertical, &scrollingGeometry.verticalSnapOffsets, &scrollingGeometry.verticalSnapOffsetRanges, m_page->deviceScaleFactor());
>-        scrollingNode->setCurrentHorizontalSnapPointIndex(scrollingGeometry.currentHorizontalSnapPointIndex);
>-        scrollingNode->setCurrentVerticalSnapPointIndex(scrollingGeometry.currentVerticalSnapPointIndex);
>+        setStateScrollingNodeSnapOffsetsAsFloat(scrollingNode, ScrollEventAxis::Horizontal, &scrollingGeometry.horizontalSnapOffsets, &scrollingGeometry.horizontalSnapOffsetRanges, m_page->deviceScaleFactor());
>+        setStateScrollingNodeSnapOffsetsAsFloat(scrollingNode, ScrollEventAxis::Vertical, &scrollingGeometry.verticalSnapOffsets, &scrollingGeometry.verticalSnapOffsetRanges, m_page->deviceScaleFactor());
>+        scrollingNode.setCurrentHorizontalSnapPointIndex(scrollingGeometry.currentHorizontalSnapPointIndex);
>+        scrollingNode.setCurrentVerticalSnapPointIndex(scrollingGeometry.currentVerticalSnapPointIndex);
>     }
> #endif
> }
>diff --git a/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.cpp b/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.cpp
>index 0cebd30b90ea5d5264c1d6b93558c0cbd7753e31..ecb64d59af0718a812151f3cdf169880eabf874f 100644
>--- a/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.cpp
>+++ b/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.cpp
>@@ -46,6 +46,7 @@ ScrollingStateFrameHostingNode::ScrollingStateFrameHostingNode(ScrollingStateTre
> 
> ScrollingStateFrameHostingNode::ScrollingStateFrameHostingNode(const ScrollingStateFrameHostingNode& stateNode, ScrollingStateTree& adoptiveTree)
>     : ScrollingStateNode(stateNode, adoptiveTree)
>+    , m_parentRelativeScrollableRect(stateNode.parentRelativeScrollableRect())
> {
> }
> 
>@@ -56,10 +57,29 @@ Ref<ScrollingStateNode> ScrollingStateFrameHostingNode::clone(ScrollingStateTree
>     return adoptRef(*new ScrollingStateFrameHostingNode(*this, adoptiveTree));
> }
> 
>+void ScrollingStateFrameHostingNode::setAllPropertiesChanged()
>+{
>+    setPropertyChangedBit(ParentRelativeScrollableRect);
>+
>+    ScrollingStateNode::setAllPropertiesChanged();
>+}
>+
>+void ScrollingStateFrameHostingNode::setParentRelativeScrollableRect(const LayoutRect& parentRelativeScrollableRect)
>+{
>+    if (m_parentRelativeScrollableRect == parentRelativeScrollableRect)
>+        return;
>+
>+    m_parentRelativeScrollableRect = parentRelativeScrollableRect;
>+    setPropertyChanged(ParentRelativeScrollableRect);
>+}
>+
> void ScrollingStateFrameHostingNode::dumpProperties(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const
> {
>     ts << "Frame hosting node";
>     ScrollingStateNode::dumpProperties(ts, behavior);
>+
>+    if (!m_parentRelativeScrollableRect.isEmpty())
>+        ts.dumpProperty("parent relative scrollable rect", m_parentRelativeScrollableRect);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.h b/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.h
>index 1afe3e677405f826b3724c1ad68fa1192c1d5bfc..e2a2e9bb04260a8ffa233e73d06d69c2c50d2330 100644
>--- a/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.h
>+++ b/Source/WebCore/page/scrolling/ScrollingStateFrameHostingNode.h
>@@ -40,11 +40,22 @@ public:
> 
>     virtual ~ScrollingStateFrameHostingNode();
> 
>+    enum ChangedProperty {
>+        ParentRelativeScrollableRect = NumStateNodeBits
>+    };
>+
>+    const LayoutRect& parentRelativeScrollableRect() const { return m_parentRelativeScrollableRect; }
>+    WEBCORE_EXPORT void setParentRelativeScrollableRect(const LayoutRect&);
>+
>     void dumpProperties(WTF::TextStream&, ScrollingStateTreeAsTextBehavior) const override;
> 
> private:
>     ScrollingStateFrameHostingNode(ScrollingStateTree&, ScrollingNodeID);
>     ScrollingStateFrameHostingNode(const ScrollingStateFrameHostingNode&, ScrollingStateTree&);
>+
>+    void setAllPropertiesChanged() override;
>+
>+    LayoutRect m_parentRelativeScrollableRect;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.cpp b/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.cpp
>index 34718e52ce91713465ec2f4c500dc6807355f7b2..24ad08fdb767d6ed35a7e9eedbe61c58b9601143 100644
>--- a/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.cpp
>+++ b/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.cpp
>@@ -29,6 +29,7 @@
> #if ENABLE(ASYNC_SCROLLING)
> 
> #include "Logging.h"
>+#include "ScrollingStateFrameHostingNode.h"
> #include "ScrollingStateTree.h"
> #include "ScrollingTree.h"
> #include <wtf/text/TextStream.h>
>@@ -48,9 +49,12 @@ ScrollingTreeFrameHostingNode::ScrollingTreeFrameHostingNode(ScrollingTree& scro
> 
> ScrollingTreeFrameHostingNode::~ScrollingTreeFrameHostingNode() = default;
> 
>-void ScrollingTreeFrameHostingNode::commitStateBeforeChildren(const ScrollingStateNode&)
>+void ScrollingTreeFrameHostingNode::commitStateBeforeChildren(const ScrollingStateNode& stateNode)
> {
>-    // Nothing to do.
>+    const ScrollingStateFrameHostingNode& frameHostingStateNode = downcast<ScrollingStateFrameHostingNode>(stateNode);
>+
>+    if (frameHostingStateNode.hasChangedProperty(ScrollingStateFrameHostingNode::ParentRelativeScrollableRect))
>+        m_parentRelativeScrollableRect = frameHostingStateNode.parentRelativeScrollableRect();
> }
> 
> void ScrollingTreeFrameHostingNode::updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta)
>@@ -66,6 +70,9 @@ void ScrollingTreeFrameHostingNode::dumpProperties(TextStream& ts, ScrollingStat
> {
>     ts << "frame hosting node";
>     ScrollingTreeNode::dumpProperties(ts, behavior);
>+
>+    if (!m_parentRelativeScrollableRect.isEmpty())
>+        ts.dumpProperty("parent relative scrollable rect", m_parentRelativeScrollableRect);
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.h b/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.h
>index fac8b5c92ee2bed01ffd7a0185b25bc6a14cb684..5c3b7974358012e2045639797f11d7f8022efe3d 100644
>--- a/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.h
>+++ b/Source/WebCore/page/scrolling/ScrollingTreeFrameHostingNode.h
>@@ -44,7 +44,11 @@ private:
>     void commitStateBeforeChildren(const ScrollingStateNode&) final;
>     void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) final;
> 
>+    const LayoutRect& parentRelativeScrollableRect() const { return m_parentRelativeScrollableRect; }
>+
>     WEBCORE_EXPORT void dumpProperties(WTF::TextStream&, ScrollingStateTreeAsTextBehavior) const override;
>+
>+    LayoutRect m_parentRelativeScrollableRect;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/rendering/RenderLayer.h b/Source/WebCore/rendering/RenderLayer.h
>index c04c40a7d4a7d11ae304b0f9f0d57a790ff1884b..63e1fd22153df7a793da4d3bb8caa730c523502f 100644
>--- a/Source/WebCore/rendering/RenderLayer.h
>+++ b/Source/WebCore/rendering/RenderLayer.h
>@@ -397,6 +397,9 @@ public:
> 
>     LayoutRect rect() const { return LayoutRect(location(), size()); }
> 
>+    IntSize visibleSize() const override;
>+    IntSize contentsSize() const override;
>+
>     int scrollWidth() const;
>     int scrollHeight() const;
> 
>@@ -1030,8 +1033,6 @@ private:
>     void setScrollOffset(const ScrollOffset&) override;
> 
>     IntRect visibleContentRectInternal(VisibleContentRectIncludesScrollbars, VisibleContentRectBehavior) const override;
>-    IntSize visibleSize() const override;
>-    IntSize contentsSize() const override;
>     IntSize overhangAmount() const override;
>     IntPoint lastKnownMousePosition() const override;
>     bool isHandlingWheelEvent() const override;
>diff --git a/Source/WebCore/rendering/RenderLayerBacking.cpp b/Source/WebCore/rendering/RenderLayerBacking.cpp
>index f4de5ec5f4137e06027056696eddb5d38d1df820..53311f5f26ef67e11f2aa6a09a27c9ee4bde0523 100644
>--- a/Source/WebCore/rendering/RenderLayerBacking.cpp
>+++ b/Source/WebCore/rendering/RenderLayerBacking.cpp
>@@ -1747,6 +1747,7 @@ bool RenderLayerBacking::updateScrollingLayers(bool needsScrollingLayers)
>         // Inner layer which renders the content that scrolls.
>         m_scrollingContentsLayer = createGraphicsLayer("scrolled Contents");
>         m_scrollingContentsLayer->setDrawsContent(true);
>+        m_scrollingContentsLayer->setAnchorPoint({ });
> 
>         GraphicsLayerPaintingPhase paintPhase = GraphicsLayerPaintOverflowContents | GraphicsLayerPaintCompositedScroll;
>         if (!m_foregroundLayer)
>diff --git a/Source/WebCore/rendering/RenderLayerCompositor.cpp b/Source/WebCore/rendering/RenderLayerCompositor.cpp
>index 27a774b8b122f14f44d961038d6c8d9633a91346..1e29ca9233f647785254556460edd5546780b3c6 100644
>--- a/Source/WebCore/rendering/RenderLayerCompositor.cpp
>+++ b/Source/WebCore/rendering/RenderLayerCompositor.cpp
>@@ -3918,6 +3918,71 @@ ScrollingNodeID RenderLayerCompositor::updateScrollingNodeForViewportConstrained
>     return newNodeID;
> }
> 
>+void RenderLayerCompositor::computeFrameScrollingGeometry(ScrollingCoordinator::ScrollingGeometry& scrollingGeometry) const
>+{
>+    auto& frameView = m_renderView.frameView();
>+
>+    if (m_renderView.frame().isMainFrame())
>+        scrollingGeometry.parentRelativeScrollableRect = frameView.frameRect();
>+    else
>+        scrollingGeometry.parentRelativeScrollableRect = LayoutRect({ }, LayoutSize(frameView.size()));
>+
>+    scrollingGeometry.scrollOrigin = frameView.scrollOrigin();
>+    scrollingGeometry.scrollableAreaSize = frameView.visibleContentRect().size();
>+    scrollingGeometry.contentSize = frameView.totalContentsSize();
>+    scrollingGeometry.reachableContentSize = frameView.totalContentsSize();
>+#if ENABLE(CSS_SCROLL_SNAP)
>+    frameView.updateSnapOffsets();
>+    updateScrollSnapPropertiesWithFrameView(frameView);
>+#endif
>+}
>+
>+void RenderLayerCompositor::computeFrameHostingGeometry(const RenderLayer& layer, const RenderLayer* ancestorLayer, ScrollingCoordinator::ScrollingGeometry& scrollingGeometry) const
>+{
>+    // FIXME: ancestorLayer needs to be always non-null, so should become a reference.
>+    if (ancestorLayer) {
>+        LayoutRect scrollableRect;
>+        if (is<RenderBox>(layer.renderer()))
>+            scrollableRect = downcast<RenderBox>(layer.renderer()).paddingBoxRect();
>+
>+        auto offset = layer.convertToLayerCoords(ancestorLayer, scrollableRect.location()); // FIXME: broken for columns.
>+        scrollableRect.setLocation(offset);
>+        scrollingGeometry.parentRelativeScrollableRect = scrollableRect;
>+    }
>+}
>+
>+void RenderLayerCompositor::computeOverflowScrollingGeometry(const RenderLayer& layer, const RenderLayer* ancestorLayer, ScrollingCoordinator::ScrollingGeometry& scrollingGeometry) const
>+{
>+    // FIXME: ancestorLayer needs to be always non-null, so should become a reference.
>+    if (ancestorLayer) {
>+        LayoutRect scrollableRect;
>+        if (is<RenderBox>(layer.renderer()))
>+            scrollableRect = downcast<RenderBox>(layer.renderer()).paddingBoxRect();
>+
>+        auto offset = layer.convertToLayerCoords(ancestorLayer, scrollableRect.location()); // FIXME: broken for columns.
>+        scrollableRect.setLocation(offset);
>+        scrollingGeometry.parentRelativeScrollableRect = scrollableRect;
>+    }
>+
>+    scrollingGeometry.scrollOrigin = layer.scrollOrigin();
>+    scrollingGeometry.scrollPosition = layer.scrollPosition();
>+    scrollingGeometry.scrollableAreaSize = layer.visibleSize();
>+    scrollingGeometry.contentSize = layer.contentsSize();
>+    scrollingGeometry.reachableContentSize = layer.scrollableContentsSize();
>+#if ENABLE(CSS_SCROLL_SNAP)
>+    if (const Vector<LayoutUnit>* offsets = layer.horizontalSnapOffsets())
>+        scrollingGeometry.horizontalSnapOffsets = *offsets;
>+    if (const Vector<LayoutUnit>* offsets = layer.verticalSnapOffsets())
>+        scrollingGeometry.verticalSnapOffsets = *offsets;
>+    if (const Vector<ScrollOffsetRange<LayoutUnit>>* ranges = layer.horizontalSnapOffsetRanges())
>+        scrollingGeometry.horizontalSnapOffsetRanges = *ranges;
>+    if (const Vector<ScrollOffsetRange<LayoutUnit>>* ranges = layer.verticalSnapOffsetRanges())
>+        scrollingGeometry.verticalSnapOffsetRanges = *ranges;
>+    scrollingGeometry.currentHorizontalSnapPointIndex = layer.currentHorizontalSnapPointIndex();
>+    scrollingGeometry.currentVerticalSnapPointIndex = layer.currentVerticalSnapPointIndex();
>+#endif
>+}
>+
> ScrollingNodeID RenderLayerCompositor::updateScrollingNodeForScrollingRole(RenderLayer& layer, ScrollingTreeState& treeState, OptionSet<ScrollingNodeChangeFlags> changes)
> {
>     auto* scrollingCoordinator = this->scrollingCoordinator();
>@@ -3940,15 +4005,7 @@ ScrollingNodeID RenderLayerCompositor::updateScrollingNodeForScrollingRole(Rende
> 
>         if (changes & ScrollingNodeChangeFlags::LayerGeometry) {
>             ScrollingCoordinator::ScrollingGeometry scrollingGeometry;
>-            // FIXME(https://webkit.org/b/172917): Pass parentRelativeScrollableRect?
>-            scrollingGeometry.scrollOrigin = frameView.scrollOrigin();
>-            scrollingGeometry.scrollableAreaSize = frameView.visibleContentRect().size();
>-            scrollingGeometry.contentSize = frameView.totalContentsSize();
>-            scrollingGeometry.reachableContentSize = frameView.totalContentsSize();
>-#if ENABLE(CSS_SCROLL_SNAP)
>-            frameView.updateSnapOffsets();
>-            scrollingCoordinator->updateScrollSnapPropertiesWithFrameView(frameView);
>-#endif
>+            computeFrameScrollingGeometry(scrollingGeometry);
>             scrollingCoordinator->setScrollingNodeGeometry(newNodeID, scrollingGeometry);
>         }
>     } else {
>@@ -3961,26 +4018,10 @@ ScrollingNodeID RenderLayerCompositor::updateScrollingNodeForScrollingRole(Rende
>         if (changes & ScrollingNodeChangeFlags::Layer)
>             scrollingCoordinator->setNodeLayers(newNodeID, layer.backing()->scrollingLayer(), layer.backing()->scrollingContentsLayer());
> 
>-        if (changes & ScrollingNodeChangeFlags::LayerGeometry) {
>+        if (changes & ScrollingNodeChangeFlags::LayerGeometry && treeState.parentNodeID) {
>+            RenderLayer* scrollingAncestorLayer = m_scrollingNodeToLayerMap.get(treeState.parentNodeID.value());
>             ScrollingCoordinator::ScrollingGeometry scrollingGeometry;
>-            // FIXME(https://webkit.org/b/172917): Pass parentRelativeScrollableRect?
>-            scrollingGeometry.scrollOrigin = layer.scrollOrigin();
>-            scrollingGeometry.scrollPosition = layer.scrollPosition();
>-            scrollingGeometry.scrollableAreaSize = layer.visibleSize();
>-            scrollingGeometry.contentSize = layer.contentsSize();
>-            scrollingGeometry.reachableContentSize = layer.scrollableContentsSize();
>-#if ENABLE(CSS_SCROLL_SNAP)
>-            if (const Vector<LayoutUnit>* offsets = layer.horizontalSnapOffsets())
>-                scrollingGeometry.horizontalSnapOffsets = *offsets;
>-            if (const Vector<LayoutUnit>* offsets = layer.verticalSnapOffsets())
>-                scrollingGeometry.verticalSnapOffsets = *offsets;
>-            if (const Vector<ScrollOffsetRange<LayoutUnit>>* ranges = layer.horizontalSnapOffsetRanges())
>-                scrollingGeometry.horizontalSnapOffsetRanges = *ranges;
>-            if (const Vector<ScrollOffsetRange<LayoutUnit>>* ranges = layer.verticalSnapOffsetRanges())
>-                scrollingGeometry.verticalSnapOffsetRanges = *ranges;
>-            scrollingGeometry.currentHorizontalSnapPointIndex = layer.currentHorizontalSnapPointIndex();
>-            scrollingGeometry.currentVerticalSnapPointIndex = layer.currentVerticalSnapPointIndex();
>-#endif
>+            computeOverflowScrollingGeometry(layer, scrollingAncestorLayer, scrollingGeometry);
>             scrollingCoordinator->setScrollingNodeGeometry(newNodeID, scrollingGeometry);
>         }
>     }
>@@ -4001,6 +4042,13 @@ ScrollingNodeID RenderLayerCompositor::updateScrollingNodeForFrameHostingRole(Re
>     if (changes & ScrollingNodeChangeFlags::Layer)
>         scrollingCoordinator->setNodeLayers(newNodeID, layer.backing()->graphicsLayer());
> 
>+    if (changes & ScrollingNodeChangeFlags::LayerGeometry && treeState.parentNodeID) {
>+        RenderLayer* scrollingAncestorLayer = m_scrollingNodeToLayerMap.get(treeState.parentNodeID.value());
>+        ScrollingCoordinator::ScrollingGeometry scrollingGeometry;
>+        computeFrameHostingGeometry(layer, scrollingAncestorLayer, scrollingGeometry);
>+        scrollingCoordinator->setScrollingNodeGeometry(newNodeID, scrollingGeometry);
>+    }
>+
>     return newNodeID;
> }
> 
>@@ -4123,7 +4171,7 @@ RefPtr<DisplayRefreshMonitor> RenderLayerCompositor::createDisplayRefreshMonitor
> #endif
> 
> #if ENABLE(CSS_SCROLL_SNAP)
>-void RenderLayerCompositor::updateScrollSnapPropertiesWithFrameView(const FrameView& frameView)
>+void RenderLayerCompositor::updateScrollSnapPropertiesWithFrameView(const FrameView& frameView) const
> {
>     if (auto* coordinator = scrollingCoordinator())
>         coordinator->updateScrollSnapPropertiesWithFrameView(frameView);
>diff --git a/Source/WebCore/rendering/RenderLayerCompositor.h b/Source/WebCore/rendering/RenderLayerCompositor.h
>index c1025777755e33021f861f806ff1b958d4a14808..60c4f45919baac10fd1144921d0517e582764515 100644
>--- a/Source/WebCore/rendering/RenderLayerCompositor.h
>+++ b/Source/WebCore/rendering/RenderLayerCompositor.h
>@@ -352,7 +352,7 @@ public:
>     void updateRootContentLayerClipping();
> 
> #if ENABLE(CSS_SCROLL_SNAP)
>-    void updateScrollSnapPropertiesWithFrameView(const FrameView&);
>+    void updateScrollSnapPropertiesWithFrameView(const FrameView&) const;
> #endif
> 
>     // For testing.
>@@ -497,6 +497,10 @@ private:
>     FixedPositionViewportConstraints computeFixedViewportConstraints(RenderLayer&) const;
>     StickyPositionViewportConstraints computeStickyViewportConstraints(RenderLayer&) const;
> 
>+    void computeFrameScrollingGeometry(ScrollingCoordinator::ScrollingGeometry&) const;
>+    void computeFrameHostingGeometry(const RenderLayer&, const RenderLayer* ancestorLayer, ScrollingCoordinator::ScrollingGeometry&) const;
>+    void computeOverflowScrollingGeometry(const RenderLayer&, const RenderLayer* ancestorLayer, ScrollingCoordinator::ScrollingGeometry&) const;
>+
>     bool requiresScrollLayer(RootLayerAttachment) const;
>     bool requiresHorizontalScrollbarLayer() const;
>     bool requiresVerticalScrollbarLayer() const;
>diff --git a/Source/WebKit/Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp b/Source/WebKit/Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp
>index 059ed28fc972a882131e33ddf8a877e6bb99004e..0d01f33c1c8284eaeba57f67f9cae10a41f56905 100644
>--- a/Source/WebKit/Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp
>+++ b/Source/WebKit/Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp
>@@ -181,6 +181,7 @@ void ArgumentCoder<ScrollingStateFrameScrollingNode>::encode(Encoder& encoder, c
> void ArgumentCoder<ScrollingStateFrameHostingNode>::encode(Encoder& encoder, const ScrollingStateFrameHostingNode& node)
> {
>     encoder << static_cast<const ScrollingStateNode&>(node);
>+    // ParentRelativeScrollableRect isn't used so we don't encode it.
> }
> 
> void ArgumentCoder<ScrollingStateOverflowScrollingNode>::encode(Encoder& encoder, const ScrollingStateOverflowScrollingNode& node)
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index beba46f50bd073b7775a9afed4fcddc46afd1532..75468551a95c255c054e254f215ae143e511a235 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,74 @@
>+2019-01-29  Simon Fraser  <simon.fraser@apple.com>
>+
>+        Add some basic geometry information to the scrolling tree
>+        https://bugs.webkit.org/show_bug.cgi?id=194002
>+        rdar://problem/47656294
>+
>+        Reviewed by NOBODY (OOPS!).
>+        
>+        New test results with "parent relative scrollable rect" output.
>+
>+        * fast/scrolling/ios/change-scrollability-on-content-resize-expected.txt:
>+        * fast/scrolling/ios/change-scrollability-on-content-resize-nested-expected.txt:
>+        * fast/scrolling/ios/overflow-scroll-touch-expected.txt:
>+        * fast/scrolling/ios/reconcile-layer-position-recursive-expected.txt:
>+        * fast/scrolling/ios/subpixel-overflow-scrolling-with-ancestor-expected.txt:
>+        * fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-expected.txt:
>+        * fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up-expected.txt:
>+        * fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt:
>+        * platform/ios-wk2/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt:
>+        * platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-expected.txt:
>+        * platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-size-expected.txt:
>+        * platform/ios/fast/scrolling/ios/scrolling-content-clip-to-viewport-expected.txt:
>+        * platform/ios/fast/scrolling/ios/textarea-scroll-touch-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt:
>+        * scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt:
>+        * tiled-drawing/scrolling/clamp-out-of-bounds-scrolls-expected.txt:
>+        * tiled-drawing/scrolling/fixed/absolute-inside-fixed-expected.txt:
>+        * tiled-drawing/scrolling/fixed/absolute-inside-out-of-view-fixed-expected.txt:
>+        * tiled-drawing/scrolling/fixed/fixed-in-overflow-expected.txt:
>+        * tiled-drawing/scrolling/fixed/fixed-position-out-of-view-expected.txt:
>+        * tiled-drawing/scrolling/fixed/fixed-position-out-of-view-negative-zindex-expected.txt:
>+        * tiled-drawing/scrolling/fixed/four-bars-expected.txt:
>+        * tiled-drawing/scrolling/fixed/four-bars-with-header-and-footer-expected.txt:
>+        * tiled-drawing/scrolling/fixed/negative-scroll-offset-expected.txt:
>+        * tiled-drawing/scrolling/fixed/negative-scroll-offset-in-view-expected.txt:
>+        * tiled-drawing/scrolling/fixed/nested-fixed-expected.txt:
>+        * tiled-drawing/scrolling/fixed/percentage-inside-fixed-expected.txt:
>+        * tiled-drawing/scrolling/frames/scroll-region-after-frame-layout-expected.txt:
>+        * tiled-drawing/scrolling/scrolling-tree-after-scroll-expected.txt:
>+        * tiled-drawing/scrolling/scrolling-tree-slow-scrolling-expected.txt:
>+        * tiled-drawing/scrolling/sticky/negative-scroll-offset-expected.txt:
>+        * tiled-drawing/scrolling/sticky/sticky-horizontal-expected.txt:
>+        * tiled-drawing/scrolling/sticky/sticky-vertical-expected.txt:
>+
> 2019-01-29  Simon Fraser  <simon.fraser@apple.com>
> 
>         Add nodes to the scrolling tree in z-index order.
>diff --git a/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-expected.txt b/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-expected.txt
>index 18c16ef08aaeb6294529d5b18d326b213505ae43..9691f78170ec0538aa276be35a342cf3ea7d1336 100644
>--- a/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-expected.txt
>+++ b/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-expected.txt
>@@ -86,6 +86,7 @@
>                   (children 1
>                     (GraphicsLayer
>                       (offsetFromRenderer width=5 height=5)
>+                      (anchor 0.00 0.00)
>                       (bounds 200.00 400.00)
>                       (drawsContent 1)
>                       (visible rect 0.00, 0.00 200.00 x 200.00)
>@@ -117,6 +118,7 @@
>                   (children 1
>                     (GraphicsLayer
>                       (offsetFromRenderer width=5 height=5)
>+                      (anchor 0.00 0.00)
>                       (bounds 200.00 400.00)
>                       (drawsContent 1)
>                       (visible rect 0.00, 0.00 200.00 x 200.00)
>@@ -140,6 +142,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -154,6 +157,7 @@
>     (Overflow scrolling node
>       (scrollable area size 200 200)
>       (contents size 200 400)
>+      (parent relative scrollable rect at (260,10) size 200x200)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>@@ -163,6 +167,7 @@
>     (Overflow scrolling node
>       (scrollable area size 200 200)
>       (contents size 200 400)
>+      (parent relative scrollable rect at (260,260) size 200x200)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-nested-expected.txt b/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-nested-expected.txt
>index b5e6c6078ab3616e4a6ee97cf20b3b4b24ec2bae..60572d383dfecfdcb9749c3ee06bfa38dd9f3c01 100644
>--- a/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-nested-expected.txt
>+++ b/LayoutTests/fast/scrolling/ios/change-scrollability-on-content-resize-nested-expected.txt
>@@ -34,6 +34,7 @@
>               (contentsScale 2.00)
>               (children 1
>                 (GraphicsLayer
>+                  (anchor 0.00 0.00)
>                   (bounds 300.00 400.00)
>                   (drawsContent 1)
>                   (visible rect 0.00, 0.00 300.00 x 200.00)
>@@ -66,6 +67,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -80,6 +82,7 @@
>     (Overflow scrolling node
>       (scrollable area size 300 200)
>       (contents size 300 400)
>+      (parent relative scrollable rect at (8,13) size 300x200)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/fast/scrolling/ios/overflow-scroll-touch-expected.txt b/LayoutTests/fast/scrolling/ios/overflow-scroll-touch-expected.txt
>index 765dc6f6569b5ce8e052503ee7b2b0e19394a34a..56670f2dd724050177c3b64ea2aa77dce575359e 100644
>--- a/LayoutTests/fast/scrolling/ios/overflow-scroll-touch-expected.txt
>+++ b/LayoutTests/fast/scrolling/ios/overflow-scroll-touch-expected.txt
>@@ -23,6 +23,7 @@
>                 (GraphicsLayer
>                   (offsetFromRenderer width=1 height=1)
>                   (scrollOffset (0,50))
>+                  (anchor 0.00 0.00)
>                   (bounds 200.00 400.00)
>                   (drawsContent 1)
>                 )
>@@ -44,6 +45,7 @@
>                 (GraphicsLayer
>                   (offsetFromRenderer width=1 height=1)
>                   (scrollOffset (0,50))
>+                  (anchor 0.00 0.00)
>                   (bounds 200.00 400.00)
>                   (drawsContent 1)
>                 )
>diff --git a/LayoutTests/fast/scrolling/ios/reconcile-layer-position-recursive-expected.txt b/LayoutTests/fast/scrolling/ios/reconcile-layer-position-recursive-expected.txt
>index 1b6f6dbeaba6a952ab05ff0e6b0fcbdb2bd018d3..190f6613ef11be853663e79fc91586c5f51241eb 100644
>--- a/LayoutTests/fast/scrolling/ios/reconcile-layer-position-recursive-expected.txt
>+++ b/LayoutTests/fast/scrolling/ios/reconcile-layer-position-recursive-expected.txt
>@@ -35,6 +35,7 @@
>               (contentsScale 2.00)
>               (children 1
>                 (GraphicsLayer
>+                  (anchor 0.00 0.00)
>                   (bounds 300.00 510.00)
>                   (drawsContent 1)
>                   (visible rect 0.00, 13.00 300.00 x 287.00)
>@@ -62,6 +63,7 @@
>                           (children 1
>                             (GraphicsLayer
>                               (offsetFromRenderer width=5 height=5)
>+                              (anchor 0.00 0.00)
>                               (bounds 270.00 610.00)
>                               (drawsContent 1)
>                               (visible rect 0.00, 0.00 200.00 x 245.00)
>diff --git a/LayoutTests/fast/scrolling/ios/subpixel-overflow-scrolling-with-ancestor-expected.txt b/LayoutTests/fast/scrolling/ios/subpixel-overflow-scrolling-with-ancestor-expected.txt
>index 828928400c2b57ffaacd7735da85b33ca7cce50e..6ea8a1a379cc51a2df546af21df538b6cf43a1eb 100644
>--- a/LayoutTests/fast/scrolling/ios/subpixel-overflow-scrolling-with-ancestor-expected.txt
>+++ b/LayoutTests/fast/scrolling/ios/subpixel-overflow-scrolling-with-ancestor-expected.txt
>@@ -16,6 +16,7 @@
>               (children 1
>                 (GraphicsLayer
>                   (scrollOffset (0,30))
>+                  (anchor 0.00 0.00)
>                   (bounds 300.00 900.00)
>                   (drawsContent 1)
>                   (children 1
>diff --git a/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-expected.txt b/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-expected.txt
>index 21d41141558003650078c575be8be23a292cf027..22ca548b990f6e5f5f5462b6a62ccd263c1693b3 100644
>--- a/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-expected.txt
>+++ b/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 4016 4042)
>   (requested scroll position 40 1000)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up-expected.txt b/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up-expected.txt
>index d22f64a14ec0a971a8be3fd4e68bcb850bd5aa5e..1b3965f2e54e12d7d4c6f4288e2589b249846d06 100644
>--- a/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up-expected.txt
>+++ b/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolled-down-then-up-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 4016 4042)
>   (requested scroll position 40 460)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state-expected.txt b/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state-expected.txt
>index 8029b8f60f9534298f17f4f8b2d2f95041e541d2..3f20e5a14274bfcda594d3545d3b4342dac51cad 100644
>--- a/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state-expected.txt
>+++ b/LayoutTests/fast/visual-viewport/tiled-drawing/zoomed-fixed-scrolling-layers-state-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 585)
>   (contents size 4016 4042)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt
>index 27ca443f3085870d17924c9b6ba272cb58fa4611..e5a76e78040ae0ab7c2624491031662d7d832907 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -14,10 +15,12 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (37,39) size 500x300)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 500 300)
>           (contents size 500 420)
>+          (parent relative scrollable rect at (0,0) size 500x300)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>@@ -32,6 +35,7 @@
>             (Overflow scrolling node
>               (scrollable area size 400 300)
>               (contents size 400 1760)
>+              (parent relative scrollable rect at (10,10) size 400x300)
>               (scrollable area parameters 
>                 (horizontal scroll elasticity 1)
>                 (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt
>index 9af13737c4061f56649588d52b6822e85181b442..3e2c9c75d69b1c7c6f5a79300914bc83ee00de98 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -19,10 +20,12 @@
>       (layer position at last layout (8,10))
>       (children 1
>         (Frame hosting node
>+          (parent relative scrollable rect at (29,29) size 500x300)
>           (children 1
>             (Frame scrolling node
>               (scrollable area size 500 300)
>               (contents size 500 420)
>+              (parent relative scrollable rect at (0,0) size 500x300)
>               (scrollable area parameters 
>                 (horizontal scroll elasticity 1)
>                 (vertical scroll elasticity 1)
>@@ -37,6 +40,7 @@
>                 (Overflow scrolling node
>                   (scrollable area size 400 300)
>                   (contents size 400 1760)
>+                  (parent relative scrollable rect at (10,10) size 400x300)
>                   (scrollable area parameters 
>                     (horizontal scroll elasticity 1)
>                     (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt
>index 28fc30e6f6f78a501f4b2e098b8a86445bca0bc9..1609cae4197d44ed937ae7d8771de3e365c06d84 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -19,10 +20,12 @@
>       (layer position at last layout (8,0))
>       (children 1
>         (Frame hosting node
>+          (parent relative scrollable rect at (29,29) size 500x300)
>           (children 1
>             (Frame scrolling node
>               (scrollable area size 500 300)
>               (contents size 500 420)
>+              (parent relative scrollable rect at (0,0) size 500x300)
>               (scrollable area parameters 
>                 (horizontal scroll elasticity 1)
>                 (vertical scroll elasticity 1)
>@@ -37,6 +40,7 @@
>                 (Overflow scrolling node
>                   (scrollable area size 400 300)
>                   (contents size 400 1760)
>+                  (parent relative scrollable rect at (10,10) size 400x300)
>                   (scrollable area parameters 
>                     (horizontal scroll elasticity 1)
>                     (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt
>index aa54c26880f1aa03a22932b822533ff704883aed..f80a475af7b68d5e249e1905d57cc4566e33cfe8 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -14,10 +15,12 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (37,39) size 500x300)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 500 300)
>           (contents size 500 420)
>+          (parent relative scrollable rect at (0,0) size 500x300)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>@@ -32,6 +35,7 @@
>             (Overflow scrolling node
>               (scrollable area size 400 300)
>               (contents size 400 1760)
>+              (parent relative scrollable rect at (10,10) size 400x300)
>               (scrollable area parameters 
>                 (horizontal scroll elasticity 1)
>                 (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt
>index 033e738014a26254b193457b9d10c285d58249de..27782bae3966a027db3da82c13e236c152df5e03 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt
>@@ -3,6 +3,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 657)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -15,12 +16,14 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (110,110) size 480x400)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 480 400)
>           (contents size 480 1016)
>           (requested scroll position 0 120)
>           (requested scroll position represents programmatic scroll 1)
>+          (parent relative scrollable rect at (0,0) size 480x400)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt
>index 0f5dc63b447deb66185498824c097d31b73721e6..5fc7fa011e0efad849e1d39dd2b2ae0efc7959d5 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -19,6 +20,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 420 320)
>       (contents size 443 1041)
>+      (parent relative scrollable rect at (9,9) size 420x320)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>@@ -28,6 +30,7 @@ Inner scrolling content
>         (Overflow scrolling node
>           (scrollable area size 420 320)
>           (contents size 420 1020)
>+          (parent relative scrollable rect at (23,63) size 420x320)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt
>index 0f5dc63b447deb66185498824c097d31b73721e6..5fc7fa011e0efad849e1d39dd2b2ae0efc7959d5 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -19,6 +20,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 420 320)
>       (contents size 443 1041)
>+      (parent relative scrollable rect at (9,9) size 420x320)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>@@ -28,6 +30,7 @@ Inner scrolling content
>         (Overflow scrolling node
>           (scrollable area size 420 320)
>           (contents size 420 1020)
>+          (parent relative scrollable rect at (23,63) size 420x320)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt
>index 730e785b8e5537ad3f07d058c771e4c93ddadf5a..8abfcb9004d003fe700666ece6d6873024380ee4 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt
>@@ -3,6 +3,7 @@ Scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -22,6 +23,7 @@ Scrolling content
>         (Overflow scrolling node
>           (scrollable area size 400 300)
>           (contents size 400 1000)
>+          (parent relative scrollable rect at (0,0) size 400x300)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt
>index 693d3ecaebef771cf27e01cd4f5b8bf5e483b1df..7a4439241e545618256578592479466a29592d16 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt
>index 276780ce9674fda8238813ca85bf34af8c07ed26..bb7951a1c6711ed5fbab09fb8d42f3712f73a8c5 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 2513)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -16,6 +17,7 @@
>     (Overflow scrolling node
>       (scrollable area size 300 400)
>       (contents size 300 2000)
>+      (parent relative scrollable rect at (14,14) size 300x400)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt
>index 2240194c88dca420a71e74ba596a13953a6adad2..1843ab3c65438bf05cd180687f0a1cdd2d85c698 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -19,6 +20,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 440 340)
>       (contents size 440 1040)
>+      (parent relative scrollable rect at (70,102) size 440x340)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt
>index a855f98b32e567e076c27abe999392b5a9017200..485f56829bbbb0fd30445e0bd4716b0cfb717531 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 1041)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -19,6 +20,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 440 340)
>       (contents size 440 1040)
>+      (parent relative scrollable rect at (70,102) size 440x340)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt
>index deb8cdd941a4ebbf0ba554354de683b5b5c2cc64..acd7100f58bf12c4c409b960c8141cd20e66af9c 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt
>@@ -3,6 +3,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -15,10 +16,12 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (0,0) size 100x200)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 100 200)
>           (contents size 308 416)
>+          (parent relative scrollable rect at (0,0) size 100x200)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt
>index f0e1c19acf46d8446b8a3490aa3595a68395824c..b0e3c0b075346ee8d8cbe65c9d62b8277fb49b39 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt
>@@ -3,6 +3,7 @@ FirstSecondThird
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt
>index c4516290f547568e7881177e9dbfae39dfcff8f2..731282f12f6186479b3075d360be38bed9b72f56 100644
>--- a/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt
>@@ -5,6 +5,7 @@ Scrolling tree on non-scrollable
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 645)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -17,10 +18,12 @@ Scrolling tree on non-scrollable
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (30,30) size 600x500)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 600 500)
>           (contents size 600 1024)
>+          (parent relative scrollable rect at (0,0) size 600x500)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>@@ -33,10 +36,12 @@ Scrolling tree on non-scrollable
>           (behavior for fixed 0)
>           (children 1
>             (Frame hosting node
>+              (parent relative scrollable rect at (10,54) size 500x400)
>               (children 1
>                 (Frame scrolling node
>                   (scrollable area size 500 400)
>                   (contents size 500 1024)
>+                  (parent relative scrollable rect at (0,0) size 500x400)
>                   (scrollable area parameters 
>                     (horizontal scroll elasticity 1)
>                     (vertical scroll elasticity 1)
>@@ -62,7 +67,8 @@ Scrolling tree on scrollable
> 
> (Frame scrolling node
>   (scrollable area size 800 600)
>-  (contents size 800 1445)
>+  (contents size 800 1515)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 1)
>     (vertical scroll elasticity 1)
>@@ -71,14 +77,16 @@ Scrolling tree on scrollable
>   (visual viewport enabled 1)
>   (layout viewport at (0,0) size 800x600)
>   (min layout viewport origin (0,0))
>-  (max layout viewport origin (0,845))
>+  (max layout viewport origin (0,915))
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (30,30) size 600x500)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 600 500)
>           (contents size 600 500)
>+          (parent relative scrollable rect at (0,0) size 600x500)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>@@ -91,10 +99,12 @@ Scrolling tree on scrollable
>           (behavior for fixed 0)
>           (children 1
>             (Frame hosting node
>+              (parent relative scrollable rect at (10,54) size 500x400)
>               (children 1
>                 (Frame scrolling node
>                   (scrollable area size 500 400)
>                   (contents size 500 1024)
>+                  (parent relative scrollable rect at (0,0) size 500x400)
>                   (scrollable area parameters 
>                     (horizontal scroll elasticity 1)
>                     (vertical scroll elasticity 1)
>diff --git a/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-expected.txt b/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-expected.txt
>index 5c20344365c64939b80bd6c2fb735dd7efe301d5..f6b3bab183b31774ebc66af90792094bf114fab2 100644
>--- a/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-expected.txt
>+++ b/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-expected.txt
>@@ -20,6 +20,7 @@
>                 (GraphicsLayer
>                   (offsetFromRenderer width=1 height=1)
>                   (scrollOffset (0,30))
>+                  (anchor 0.00 0.00)
>                   (bounds 300.00 900.00)
>                   (drawsContent 1)
>                   (children 1
>diff --git a/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-size-expected.txt b/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-size-expected.txt
>index ff20cafe545b9724dcdd273b7bceb4e5e73221ec..82435306ea04360c1f4670bcd4e6b2c65a8d93c2 100644
>--- a/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-size-expected.txt
>+++ b/LayoutTests/platform/ios/fast/scrolling/ios/overflow-scrolling-ancestor-clip-size-expected.txt
>@@ -20,6 +20,7 @@
>                 (GraphicsLayer
>                   (offsetFromRenderer width=11 height=11)
>                   (scrollOffset (0,30))
>+                  (anchor 0.00 0.00)
>                   (bounds 300.00 900.00)
>                   (drawsContent 1)
>                   (children 1
>diff --git a/LayoutTests/platform/ios/fast/scrolling/ios/scrolling-content-clip-to-viewport-expected.txt b/LayoutTests/platform/ios/fast/scrolling/ios/scrolling-content-clip-to-viewport-expected.txt
>index b0c7ae744146701a1eea252fed98d273a4c3b4be..1bb2bf8edf8c8a26899165d2ee8597b2d36115d1 100644
>--- a/LayoutTests/platform/ios/fast/scrolling/ios/scrolling-content-clip-to-viewport-expected.txt
>+++ b/LayoutTests/platform/ios/fast/scrolling/ios/scrolling-content-clip-to-viewport-expected.txt
>@@ -13,6 +13,7 @@
>               (bounds 320.00 340.00)
>               (children 1
>                 (GraphicsLayer
>+                  (anchor 0.00 0.00)
>                   (bounds 320.00 1224.00)
>                   (drawsContent 1)
>                 )
>diff --git a/LayoutTests/platform/ios/fast/scrolling/ios/textarea-scroll-touch-expected.txt b/LayoutTests/platform/ios/fast/scrolling/ios/textarea-scroll-touch-expected.txt
>index a89c9927feba7646cb0a59a415ec98bbc393be88..8770b179a9bb5b1390f3de8fe78b3ad643a46439 100644
>--- a/LayoutTests/platform/ios/fast/scrolling/ios/textarea-scroll-touch-expected.txt
>+++ b/LayoutTests/platform/ios/fast/scrolling/ios/textarea-scroll-touch-expected.txt
>@@ -21,6 +21,7 @@
>                 (GraphicsLayer
>                   (offsetFromRenderer width=1 height=1)
>                   (scrollOffset (0,50))
>+                  (anchor 0.00 0.00)
>                   (bounds 204.00 270.00)
>                   (drawsContent 1)
>                 )
>@@ -43,6 +44,7 @@
>                 (GraphicsLayer
>                   (offsetFromRenderer width=1 height=1)
>                   (scrollOffset (0,50))
>+                  (anchor 0.00 0.00)
>                   (bounds 204.00 270.00)
>                   (drawsContent 1)
>                 )
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt
>index 35ba543692421457933d693581d42102b79999f5..0e4fe25bb1714a186b7888b135d3eb6348223dbf 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -17,10 +18,12 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (37,39) size 500x300)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 485 300)
>           (contents size 485 420)
>+          (parent relative scrollable rect at (0,0) size 500x300)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 0)
>             (vertical scroll elasticity 0)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt
>index ef8d8343298dc6821d944ff0d81f854103a7912e..88fde808f4d9ee93bbde5c1bb18d797fe8e7fc16 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-gain-scrolling-ancestor-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -22,10 +23,12 @@
>       (layer position at last layout (8,10))
>       (children 1
>         (Frame hosting node
>+          (parent relative scrollable rect at (29,29) size 500x300)
>           (children 1
>             (Frame scrolling node
>               (scrollable area size 500 300)
>               (contents size 500 420)
>+              (parent relative scrollable rect at (0,0) size 500x300)
>               (scrollable area parameters 
>                 (horizontal scroll elasticity 0)
>                 (vertical scroll elasticity 0)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt
>index e0e494ef5bc96be4dfaef930c4c5fde3232317b0..beaff96fd3445cfe091f5354c1776615060accae 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-in-fixed-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -22,10 +23,12 @@
>       (layer position at last layout (8,0))
>       (children 1
>         (Frame hosting node
>+          (parent relative scrollable rect at (29,29) size 500x300)
>           (children 1
>             (Frame scrolling node
>               (scrollable area size 485 300)
>               (contents size 485 420)
>+              (parent relative scrollable rect at (0,0) size 500x300)
>               (scrollable area parameters 
>                 (horizontal scroll elasticity 0)
>                 (vertical scroll elasticity 0)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt
>index 0d27984f8a6a44121cb383e33324b31cadb0e43c..143134af8f42bba6bd04a502ca191777d5231dc1 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/coordinated-frame-lose-scrolling-ancestor-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -17,10 +18,12 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (37,39) size 500x300)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 500 300)
>           (contents size 500 420)
>+          (parent relative scrollable rect at (0,0) size 500x300)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 0)
>             (vertical scroll elasticity 0)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt
>index b8adf93adabff5af9f4cbebb939315d89ed899ce..daa30499a555267ae8119daf77dd77b0cccddcff 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/fixed-inside-frame-expected.txt
>@@ -3,6 +3,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 657)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -16,12 +17,14 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (110,110) size 480x400)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 465 400)
>           (contents size 465 1016)
>           (requested scroll position 0 120)
>           (requested scroll position represents programmatic scroll 1)
>+          (parent relative scrollable rect at (0,0) size 480x400)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 0)
>             (vertical scroll elasticity 0)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt
>index 1f123a182a749410966ae7e08e3173e2c4a2f88d..18c26fae34842140d0aa07f377dfdaa6ffb7ca0f 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/gain-scrolling-node-parent-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -19,6 +20,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 405 305)
>       (contents size 443 1039)
>+      (parent relative scrollable rect at (9,9) size 405x305)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>@@ -28,6 +30,7 @@ Inner scrolling content
>         (Overflow scrolling node
>           (scrollable area size 405 305)
>           (contents size 405 1020)
>+          (parent relative scrollable rect at (23,59) size 405x305)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt
>index 1f123a182a749410966ae7e08e3173e2c4a2f88d..18c26fae34842140d0aa07f377dfdaa6ffb7ca0f 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/lose-scrolling-node-parent-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -19,6 +20,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 405 305)
>       (contents size 443 1039)
>+      (parent relative scrollable rect at (9,9) size 405x305)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>@@ -28,6 +30,7 @@ Inner scrolling content
>         (Overflow scrolling node
>           (scrollable area size 405 305)
>           (contents size 405 1020)
>+          (parent relative scrollable rect at (23,59) size 405x305)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt
>index 0d2b4d05f98e49117ea8a98f39d15c06d49fe392..ca3c47f5ad01244cbc15d7ee8ed5bfbef023d72e 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/overflow-in-fixed-expected.txt
>@@ -3,6 +3,7 @@ Scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -22,6 +23,7 @@ Scrolling content
>         (Overflow scrolling node
>           (scrollable area size 385 285)
>           (contents size 385 1000)
>+          (parent relative scrollable rect at (0,0) size 385x285)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 1)
>             (vertical scroll elasticity 1)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt
>index 82e9b4c90eee138b9f5d2c01e1d92a05eefbca2c..96234027afa800605d0b32ac192d50e8fb4cd7cf 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/remove-coordinated-frame-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1016)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt
>index 703ce5afa8a1b2adc9bbdfba8979c5787c140e11..575858ceb663198bff176570fa11b83e85106b1d 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/remove-scrolling-role-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 2513)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -17,6 +18,7 @@
>     (Overflow scrolling node
>       (scrollable area size 285 400)
>       (contents size 285 2000)
>+      (parent relative scrollable rect at (14,14) size 285x400)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt
>index 691b8346faf7902f066962f7576dbe5bd02f0dd6..6c17932685c4230b32e32d78c9107896e8776978 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-across-compositing-layers-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -19,6 +20,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 425 325)
>       (contents size 425 1040)
>+      (parent relative scrollable rect at (70,98) size 425x325)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt
>index 7b1e5616227262454a9c0dcceda9ace27524cd95..d2f664ba9bfbe06b3109d2ac45cd3ebaea63a436 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/reparent-with-layer-removal-expected.txt
>@@ -5,6 +5,7 @@ Inner scrolling content
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1041)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -20,6 +21,7 @@ Inner scrolling content
>     (Overflow scrolling node
>       (scrollable area size 425 325)
>       (contents size 425 1040)
>+      (parent relative scrollable rect at (70,98) size 425x325)
>       (scrollable area parameters 
>         (horizontal scroll elasticity 1)
>         (vertical scroll elasticity 1)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt
>index 38d2f710be3e73bbd1c70384568718a17ec945b0..51a795108053e196c371286f194c2d53d0393715 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-includes-frame-expected.txt
>@@ -3,6 +3,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -15,10 +16,12 @@
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (0,0) size 100x200)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 85 185)
>           (contents size 308 416)
>+          (parent relative scrollable rect at (0,0) size 100x200)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 0)
>             (vertical scroll elasticity 0)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt
>index 6865a1ab5632e814ddf112308dad62916075283f..7a30992215b3d1776151c6b1c0310548f222b492 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/scrolling-tree-is-z-order-expected.txt
>@@ -3,6 +3,7 @@ FirstSecondThird
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt b/LayoutTests/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt
>index 8323c1e0c1dbc314f1fd97dbcc9fcf3bcb5f0d6b..f1a58cda1ff511a317096d1e8468ac1c7d2e1bf4 100644
>--- a/LayoutTests/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt
>+++ b/LayoutTests/scrollingcoordinator/scrolling-tree/toggle-coordinated-frame-scrolling-expected.txt
>@@ -5,6 +5,7 @@ Scrolling tree on non-scrollable
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 640)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -18,10 +19,12 @@ Scrolling tree on non-scrollable
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (30,30) size 600x500)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 585 500)
>           (contents size 585 1024)
>+          (parent relative scrollable rect at (0,0) size 600x500)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 0)
>             (vertical scroll elasticity 0)
>@@ -35,10 +38,12 @@ Scrolling tree on non-scrollable
>           (behavior for fixed 0)
>           (children 1
>             (Frame hosting node
>+              (parent relative scrollable rect at (10,52) size 500x400)
>               (children 1
>                 (Frame scrolling node
>                   (scrollable area size 485 400)
>                   (contents size 485 1024)
>+                  (parent relative scrollable rect at (0,0) size 500x400)
>                   (scrollable area parameters 
>                     (horizontal scroll elasticity 0)
>                     (vertical scroll elasticity 0)
>@@ -65,7 +70,8 @@ Scrolling tree on scrollable
> 
> (Frame scrolling node
>   (scrollable area size 785 600)
>-  (contents size 785 1541)
>+  (contents size 785 1616)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -75,14 +81,16 @@ Scrolling tree on scrollable
>   (visual viewport enabled 1)
>   (layout viewport at (0,0) size 785x600)
>   (min layout viewport origin (0,0))
>-  (max layout viewport origin (0,941))
>+  (max layout viewport origin (0,1016))
>   (behavior for fixed 0)
>   (children 1
>     (Frame hosting node
>+      (parent relative scrollable rect at (30,30) size 600x500)
>       (children 1
>         (Frame scrolling node
>           (scrollable area size 600 500)
>           (contents size 600 500)
>+          (parent relative scrollable rect at (0,0) size 600x500)
>           (scrollable area parameters 
>             (horizontal scroll elasticity 0)
>             (vertical scroll elasticity 0)
>@@ -95,10 +103,12 @@ Scrolling tree on scrollable
>           (behavior for fixed 0)
>           (children 1
>             (Frame hosting node
>+              (parent relative scrollable rect at (10,52) size 500x400)
>               (children 1
>                 (Frame scrolling node
>                   (scrollable area size 485 400)
>                   (contents size 485 1024)
>+                  (parent relative scrollable rect at (0,0) size 500x400)
>                   (scrollable area parameters 
>                     (horizontal scroll elasticity 0)
>                     (vertical scroll elasticity 0)
>diff --git a/LayoutTests/tiled-drawing/scrolling/clamp-out-of-bounds-scrolls-expected.txt b/LayoutTests/tiled-drawing/scrolling/clamp-out-of-bounds-scrolls-expected.txt
>index 21e596804e2ec5544d252728fefbe2612dcb7f95..b351ab23030a1984de68c83217b1265483c9fef8 100644
>--- a/LayoutTests/tiled-drawing/scrolling/clamp-out-of-bounds-scrolls-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/clamp-out-of-bounds-scrolls-expected.txt
>@@ -3,6 +3,7 @@ Attempted scroll to -5000, 0
> (Frame scrolling node
>   (scrollable area size 785 585)
>   (contents size 5008 5021)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -22,6 +23,7 @@ Attempted scroll to 0, -5000
> (Frame scrolling node
>   (scrollable area size 785 585)
>   (contents size 5008 5021)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -41,6 +43,7 @@ Attempted scroll to -5000, -5000
> (Frame scrolling node
>   (scrollable area size 785 585)
>   (contents size 5008 5021)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -62,6 +65,7 @@ Attempted scroll to 10000, 0
>   (contents size 5008 5021)
>   (requested scroll position 4223 0)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -83,6 +87,7 @@ Attempted scroll to 0, 10000
>   (contents size 5008 5021)
>   (requested scroll position 0 4436)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>@@ -104,6 +109,7 @@ Attempted scroll to 10000, 10000
>   (contents size 5008 5021)
>   (requested scroll position 4223 4436)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-fixed-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-fixed-expected.txt
>index 2fbfe6e60638ef620725e766b34db9709e015a33..177cb4cb75372dd1b64f23109a87c40f9912f62e 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-fixed-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-fixed-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 2710)
>   (requested scroll position 0 200)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-out-of-view-fixed-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-out-of-view-fixed-expected.txt
>index 368e654ee484808e16ba9f0a68c0596669f19f8e..8c21447ad66d926dd91e0b6b23d0cf24bae8aeed 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-out-of-view-fixed-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/absolute-inside-out-of-view-fixed-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 2513)
>   (requested scroll position 0 200)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/fixed-in-overflow-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/fixed-in-overflow-expected.txt
>index f8ec0fd491e284c812147343f182c837e76c57f1..0c3c3c9fdc23ffd0550165de36f63f498c9161c5 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/fixed-in-overflow-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/fixed-in-overflow-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 2213)
>   (requested scroll position 0 200)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-expected.txt
>index 9032b133d2ba133f20ae2e6a4c63a947e6ab4ccf..24cdde0496b65038172e7459bec2d92d37c9f279 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1021)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-negative-zindex-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-negative-zindex-expected.txt
>index 9032b133d2ba133f20ae2e6a4c63a947e6ab4ccf..24cdde0496b65038172e7459bec2d92d37c9f279 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-negative-zindex-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/fixed-position-out-of-view-negative-zindex-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 1021)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-expected.txt
>index bf00f9c22da7a8e8d0ef04c707116c7023893e57..11fa988ca9bf86b9081e53be84f1b43d907b2d22 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 2221)
>   (requested scroll position 0 200)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-with-header-and-footer-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-with-header-and-footer-expected.txt
>index a454dbfd27ce7ce476c0aee6c535f990368a413e..168965a864001f27c8eb03bfb9579b3a257db975 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-with-header-and-footer-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/four-bars-with-header-and-footer-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 2421)
>   (requested scroll position 0 200)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-expected.txt
>index 685d155aef027fb37f9e77236e00b2c711b0c3a9..8eba230babe21ebb16bb89e12155da1ff2839ff8 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 2221)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-in-view-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-in-view-expected.txt
>index 26124bca444743db675f57d180071d23ff4a9622..c081d0412b9f8805e3d4ac367d2524fed1b0cf4d 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-in-view-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/negative-scroll-offset-in-view-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 2221)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/nested-fixed-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/nested-fixed-expected.txt
>index 34111e85abea866b7349ded5256df04489842d1b..1e0873dc987aad571e435deec3332ed710dd9ee2 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/nested-fixed-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/nested-fixed-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 2213)
>   (requested scroll position 0 200)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/fixed/percentage-inside-fixed-expected.txt b/LayoutTests/tiled-drawing/scrolling/fixed/percentage-inside-fixed-expected.txt
>index 10ddb14d2f868bfc32537509af2e196ffd92f47e..98fdb8c13dbc3c1613787c484c3eb694dd39a1d8 100644
>--- a/LayoutTests/tiled-drawing/scrolling/fixed/percentage-inside-fixed-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/fixed/percentage-inside-fixed-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 2513)
>   (requested scroll position 0 200)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/frames/scroll-region-after-frame-layout-expected.txt b/LayoutTests/tiled-drawing/scrolling/frames/scroll-region-after-frame-layout-expected.txt
>index a8489851e09c6517270b2d5b76664e03fb2ff9a6..f2437bcd73a5c7fb44a6ef2c57b6969612f3821c 100644
>--- a/LayoutTests/tiled-drawing/scrolling/frames/scroll-region-after-frame-layout-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/frames/scroll-region-after-frame-layout-expected.txt
>@@ -3,6 +3,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 757)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/scrolling-tree-after-scroll-expected.txt b/LayoutTests/tiled-drawing/scrolling/scrolling-tree-after-scroll-expected.txt
>index 2c9b4ac7e0374deb12fe7fb1b6a52cebfe4d1442..91a966fc571909639607189fc5871fcc63ee21ec 100644
>--- a/LayoutTests/tiled-drawing/scrolling/scrolling-tree-after-scroll-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/scrolling-tree-after-scroll-expected.txt
>@@ -4,6 +4,7 @@
>   (contents size 785 5021)
>   (requested scroll position 0 3000)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/scrolling-tree-slow-scrolling-expected.txt b/LayoutTests/tiled-drawing/scrolling/scrolling-tree-slow-scrolling-expected.txt
>index a1304d89c3146efd574d0196650e541f0ed7a89b..73b51b6a746366b2b898ce7acffc0052aab67835 100644
>--- a/LayoutTests/tiled-drawing/scrolling/scrolling-tree-slow-scrolling-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/scrolling-tree-slow-scrolling-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 800 600)
>   (contents size 800 600)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/sticky/negative-scroll-offset-expected.txt b/LayoutTests/tiled-drawing/scrolling/sticky/negative-scroll-offset-expected.txt
>index 24fbfcb7823b07a07ecf80f206b3f4a2185defd2..3c297b5cfc6c5b1e4295b25fe38e86c310571c8b 100644
>--- a/LayoutTests/tiled-drawing/scrolling/sticky/negative-scroll-offset-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/sticky/negative-scroll-offset-expected.txt
>@@ -2,6 +2,7 @@
> (Frame scrolling node
>   (scrollable area size 785 600)
>   (contents size 785 2216)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/sticky/sticky-horizontal-expected.txt b/LayoutTests/tiled-drawing/scrolling/sticky/sticky-horizontal-expected.txt
>index 27ff523057967f3a6d5d86b2a282ec48960aaa58..c0ed0bd0f54051bcccb0c798725bbbc583651c87 100644
>--- a/LayoutTests/tiled-drawing/scrolling/sticky/sticky-horizontal-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/sticky/sticky-horizontal-expected.txt
>@@ -5,6 +5,7 @@ Left sticky Right sticky Left % sticky Right % sticky Left and Right Left and Ri
>   (contents size 2008 585)
>   (requested scroll position 800 0)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)
>diff --git a/LayoutTests/tiled-drawing/scrolling/sticky/sticky-vertical-expected.txt b/LayoutTests/tiled-drawing/scrolling/sticky/sticky-vertical-expected.txt
>index 311b82135f41d89c563a70d54fb848f8806ebf0f..502e92547588bb7bc5bd42a4b99b16da067d0297 100644
>--- a/LayoutTests/tiled-drawing/scrolling/sticky/sticky-vertical-expected.txt
>+++ b/LayoutTests/tiled-drawing/scrolling/sticky/sticky-vertical-expected.txt
>@@ -9,6 +9,7 @@ Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
>   (contents size 785 2908)
>   (requested scroll position 0 580)
>   (requested scroll position represents programmatic scroll 1)
>+  (parent relative scrollable rect at (0,0) size 800x600)
>   (scrollable area parameters 
>     (horizontal scroll elasticity 2)
>     (vertical scroll elasticity 2)

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Attachments on bug 194002: 360546 | 360548 | 360552 | 360559