Attachment 360864 Details for Bug 194160 – patch

[patch] patch

scrolling-tree-scrolling-layer.patch (text/plain), 48.13 KB, created by Antti Koivisto on 2019-02-01 09:04:48 PST

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Creator: Antti Koivisto

Created: 2019-02-01 09:04:48 PST

Size: 48.13 KB

patch

obsolete

>Index: Source/WebCore/ChangeLog
>===================================================================
>--- Source/WebCore/ChangeLog	(revision 240855)
>+++ Source/WebCore/ChangeLog	(working copy)
>@@ -1,3 +1,68 @@
>+2019-02-01  Antti Koivisto  <antti@apple.com>
>+
>+        Don't use base layer() as the scroll layer in scrolling tree.
>+        https://bugs.webkit.org/show_bug.cgi?id=194160
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Maintain scrollContainerLayer() and scrolledContestsLayer() separately in ScrollingTreeScrollingNode.
>+
>+        * page/scrolling/AsyncScrollingCoordinator.cpp:
>+        (WebCore::AsyncScrollingCoordinator::frameViewRootLayerDidChange):
>+        (WebCore::AsyncScrollingCoordinator::setNodeLayers):
>+        * page/scrolling/AsyncScrollingCoordinator.h:
>+        * page/scrolling/ScrollingCoordinator.h:
>+        (WebCore::ScrollingCoordinator::setNodeLayers):
>+
>+        Turn the long layer parameter list into a struct.
>+
>+        * page/scrolling/ScrollingStateNode.cpp:
>+        (WebCore::ScrollingStateNode::ScrollingStateNode):
>+        (WebCore::ScrollingStateNode::setAllPropertiesChanged):
>+        (WebCore::ScrollingStateNode::setLayer):
>+        * page/scrolling/ScrollingStateNode.h:
>+        * page/scrolling/ScrollingStateScrollingNode.cpp:
>+        (WebCore::ScrollingStateScrollingNode::ScrollingStateScrollingNode):
>+        (WebCore::ScrollingStateScrollingNode::setAllPropertiesChanged):
>+        (WebCore::ScrollingStateScrollingNode::setScrollContainerLayer):
>+        (WebCore::ScrollingStateScrollingNode::dumpProperties const):
>+        * page/scrolling/ScrollingStateScrollingNode.h:
>+        (WebCore::ScrollingStateScrollingNode::scrollContainerLayer const):
>+        * page/scrolling/ScrollingTree.cpp:
>+        (WebCore::ScrollingTree::commitTreeState):
>+        * page/scrolling/ScrollingTreeScrollingNode.cpp:
>+        (WebCore::ScrollingTreeScrollingNode::commitStateBeforeChildren):
>+        * page/scrolling/ScrollingTreeScrollingNode.h:
>+        (WebCore::ScrollingTreeScrollingNode::scrollContainerLayer const):
>+        (WebCore::ScrollingTreeScrollingNode::scrolledContentsLayer const):
>+        * page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h:
>+        * page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm:
>+        (WebCore::ScrollingTreeFrameScrollingNodeIOS::commitStateBeforeChildren):
>+        (WebCore::ScrollingTreeFrameScrollingNodeIOS::scrollPosition const):
>+        (WebCore::ScrollingTreeFrameScrollingNodeIOS::setScrollLayerPosition):
>+        (WebCore::ScrollingTreeFrameScrollingNodeIOS::scrollLayer const): Deleted.
>+        * page/scrolling/mac/ScrollingTreeFixedNode.mm:
>+        (WebCore::ScrollingTreeFixedNode::commitStateBeforeChildren):
>+        * page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h:
>+        * page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm:
>+        (WebCore::ScrollingTreeFrameScrollingNodeMac::commitStateBeforeChildren):
>+        (WebCore::ScrollingTreeFrameScrollingNodeMac::commitStateAfterChildren):
>+        (WebCore::ScrollingTreeFrameScrollingNodeMac::scrollPosition const):
>+        (WebCore::ScrollingTreeFrameScrollingNodeMac::setScrollLayerPosition):
>+        (WebCore::ScrollingTreeFrameScrollingNodeMac::exposedUnfilledArea const):
>+        * page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.h:
>+        * page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.mm:
>+        (WebCore::ScrollingTreeOverflowScrollingNodeMac::commitStateBeforeChildren):
>+        (WebCore::ScrollingTreeOverflowScrollingNodeMac::scrollPosition const):
>+        (WebCore::ScrollingTreeOverflowScrollingNodeMac::setScrollLayerPosition):
>+        * page/scrolling/mac/ScrollingTreeStickyNode.mm:
>+        (WebCore::ScrollingTreeStickyNode::commitStateBeforeChildren):
>+        * rendering/RenderLayerCompositor.cpp:
>+        (WebCore::RenderLayerCompositor::didChangePlatformLayerForLayer):
>+        (WebCore::RenderLayerCompositor::updateScrollingNodeForViewportConstrainedRole):
>+        (WebCore::RenderLayerCompositor::updateScrollingNodeForScrollingRole):
>+        (WebCore::RenderLayerCompositor::updateScrollingNodeForFrameHostingRole):
>+
> 2019-02-01  Simon Fraser  <simon.fraser@apple.com>
> 
>         REGRESSION (r240698): fast/scrolling/sticky-to-fixed.html can cause a crash
>Index: Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp
>===================================================================
>--- Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp	(revision 240855)
>+++ Source/WebCore/page/scrolling/AsyncScrollingCoordinator.cpp	(working copy)
>@@ -226,7 +226,7 @@ void AsyncScrollingCoordinator::frameVie
>     ScrollingCoordinator::frameViewRootLayerDidChange(frameView);
> 
>     auto* node = downcast<ScrollingStateFrameScrollingNode>(m_scrollingStateTree->stateNodeForID(frameView.scrollingNodeID()));
>-    node->setLayer(scrollLayerForFrameView(frameView));
>+    node->setScrolledContentsLayer(scrollLayerForFrameView(frameView));
>     node->setRootContentsLayer(rootContentsLayerForFrameView(frameView));
>     node->setCounterScrollingLayer(counterScrollingLayerForFrameView(frameView));
>     node->setInsetClipLayer(insetClipLayerForFrameView(frameView));
>@@ -573,25 +573,25 @@ void AsyncScrollingCoordinator::ensureRo
>     insertNode(ScrollingNodeType::MainFrame, frameView.scrollingNodeID(), 0, 0);
> }
> 
>-void AsyncScrollingCoordinator::setNodeLayers(ScrollingNodeID nodeID, GraphicsLayer* layer, GraphicsLayer* scrolledContentsLayer, GraphicsLayer* counterScrollingLayer, GraphicsLayer* insetClipLayer, GraphicsLayer* rootContentsLayer)
>+void AsyncScrollingCoordinator::setNodeLayers(ScrollingNodeID nodeID, const NodeLayers& nodeLayers)
> {
>     auto* node = m_scrollingStateTree->stateNodeForID(nodeID);
>     ASSERT(node);
>     if (!node)
>         return;
> 
>-    node->setLayer(layer);
>+    node->setLayer(nodeLayers.layer);
> 
>     if (is<ScrollingStateScrollingNode>(node)) {
>         auto& scrollingNode = downcast<ScrollingStateScrollingNode>(*node);
>-        // FIXME: Currently unused.
>-        scrollingNode.setScrolledContentsLayer(scrolledContentsLayer);
>+        scrollingNode.setScrollContainerLayer(nodeLayers.scrollContainerLayer);
>+        scrollingNode.setScrolledContentsLayer(nodeLayers.scrolledContentsLayer);
> 
>         if (is<ScrollingStateFrameScrollingNode>(node)) {
>             auto& frameScrollingNode = downcast<ScrollingStateFrameScrollingNode>(*node);
>-            frameScrollingNode.setInsetClipLayer(insetClipLayer);
>-            frameScrollingNode.setCounterScrollingLayer(counterScrollingLayer);
>-            frameScrollingNode.setRootContentsLayer(rootContentsLayer);
>+            frameScrollingNode.setInsetClipLayer(nodeLayers.insetClipLayer);
>+            frameScrollingNode.setCounterScrollingLayer(nodeLayers.counterScrollingLayer);
>+            frameScrollingNode.setRootContentsLayer(nodeLayers.rootContentsLayer);
>         }
>     }
> }
>Index: Source/WebCore/page/scrolling/AsyncScrollingCoordinator.h
>===================================================================
>--- Source/WebCore/page/scrolling/AsyncScrollingCoordinator.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/AsyncScrollingCoordinator.h	(working copy)
>@@ -108,7 +108,7 @@ private:
>     WEBCORE_EXPORT ScrollingNodeID parentOfNode(ScrollingNodeID) const override;
>     WEBCORE_EXPORT Vector<ScrollingNodeID> childrenOfNode(ScrollingNodeID) const override;
> 
>-    WEBCORE_EXPORT void setNodeLayers(ScrollingNodeID, GraphicsLayer* /*layer*/, GraphicsLayer* /*scrolledContentsLayer*/ = nullptr, GraphicsLayer* /*counterScrollingLayer*/ = nullptr, GraphicsLayer* /*insetClipLayer*/ = nullptr, GraphicsLayer* /*rootContentsLayer*/ = nullptr) override;
>+    WEBCORE_EXPORT void setNodeLayers(ScrollingNodeID, const NodeLayers&) override;
>     WEBCORE_EXPORT void setScrollingNodeGeometry(ScrollingNodeID, const ScrollingGeometry&) override;
>     WEBCORE_EXPORT void setViewportConstraintedNodeGeometry(ScrollingNodeID, const ViewportConstraints&) override;
> 
>Index: Source/WebCore/page/scrolling/ScrollingCoordinator.h
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingCoordinator.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingCoordinator.h	(working copy)
>@@ -129,7 +129,15 @@ public:
>     virtual ScrollingNodeID parentOfNode(ScrollingNodeID) const { return 0; }
>     virtual Vector<ScrollingNodeID> childrenOfNode(ScrollingNodeID) const { return { }; }
> 
>-    virtual void setNodeLayers(ScrollingNodeID, GraphicsLayer* /*layer*/, GraphicsLayer* /*scrolledContentsLayer*/ = nullptr, GraphicsLayer* /*counterScrollingLayer*/ = nullptr, GraphicsLayer* /*insetClipLayer*/ = nullptr, GraphicsLayer* /*rootContentsLayer*/ = nullptr) { }
>+    struct NodeLayers {
>+        GraphicsLayer* layer { nullptr };
>+        GraphicsLayer* scrollContainerLayer { nullptr };
>+        GraphicsLayer* scrolledContentsLayer { nullptr };
>+        GraphicsLayer* counterScrollingLayer { nullptr };
>+        GraphicsLayer* insetClipLayer { nullptr };
>+        GraphicsLayer* rootContentsLayer { nullptr };
>+    };
>+    virtual void setNodeLayers(ScrollingNodeID, const NodeLayers&) { }
> 
>     struct ScrollingGeometry {
>         LayoutRect parentRelativeScrollableRect;
>Index: Source/WebCore/page/scrolling/ScrollingStateNode.cpp
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingStateNode.cpp	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingStateNode.cpp	(working copy)
>@@ -51,7 +51,7 @@ ScrollingStateNode::ScrollingStateNode(c
>     , m_changedProperties(stateNode.changedProperties())
>     , m_scrollingStateTree(adoptiveTree)
> {
>-    if (hasChangedProperty(ScrollLayer))
>+    if (hasChangedProperty(Layer))
>         setLayer(stateNode.layer().toRepresentation(adoptiveTree.preferredLayerRepresentation()));
>     scrollingStateTree().addNode(*this);
> }
>@@ -69,7 +69,7 @@ void ScrollingStateNode::setPropertyChan
> 
> void ScrollingStateNode::setAllPropertiesChanged()
> {
>-    setPropertyChangedBit(ScrollLayer);
>+    setPropertyChangedBit(Layer);
>     setPropertyChangedBit(ChildNodes);
>     m_scrollingStateTree.setHasChangedProperties();
> }
>@@ -167,7 +167,7 @@ void ScrollingStateNode::setLayer(const 
>     
>     m_layer = layerRepresentation;
> 
>-    setPropertyChanged(ScrollLayer);
>+    setPropertyChanged(Layer);
> }
> 
> void ScrollingStateNode::dumpProperties(TextStream& ts, ScrollingStateTreeAsTextBehavior behavior) const
>Index: Source/WebCore/page/scrolling/ScrollingStateNode.h
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingStateNode.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingStateNode.h	(working copy)
>@@ -209,7 +209,7 @@ public:
> 
>     // FIXME: using an OptionSet<> for these and derived class bits would simplify code.
>     enum {
>-        ScrollLayer = 0,
>+        Layer = 0,
>         ChildNodes,
>         NumStateNodeBits // This must remain at the last position.
>     };
>Index: Source/WebCore/page/scrolling/ScrollingStateScrollingNode.cpp
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingStateScrollingNode.cpp	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingStateScrollingNode.cpp	(working copy)
>@@ -54,6 +54,8 @@ ScrollingStateScrollingNode::ScrollingSt
>     , m_requestedScrollPositionRepresentsProgrammaticScroll(stateNode.requestedScrollPositionRepresentsProgrammaticScroll())
>     , m_expectsWheelEventTestTrigger(stateNode.expectsWheelEventTestTrigger())
> {
>+    if (hasChangedProperty(ScrollContainerLayer))
>+        setScrollContainerLayer(stateNode.scrollContainerLayer().toRepresentation(adoptiveTree.preferredLayerRepresentation()));
>     if (hasChangedProperty(ScrolledContentsLayer))
>         setScrolledContentsLayer(stateNode.scrolledContentsLayer().toRepresentation(adoptiveTree.preferredLayerRepresentation()));
> }
>@@ -79,6 +81,7 @@ void ScrollingStateScrollingNode::setAll
>     setPropertyChangedBit(CurrentVerticalSnapOffsetIndex);
> #endif
>     setPropertyChangedBit(ExpectsWheelEventTestTrigger);
>+    setPropertyChangedBit(ScrollContainerLayer);
>     setPropertyChangedBit(ScrolledContentsLayer);
> 
>     ScrollingStateNode::setAllPropertiesChanged();
>@@ -219,6 +222,15 @@ void ScrollingStateScrollingNode::setExp
>     setPropertyChanged(ExpectsWheelEventTestTrigger);
> }
> 
>+void ScrollingStateScrollingNode::setScrollContainerLayer(const LayerRepresentation& layerRepresentation)
>+{
>+    if (layerRepresentation == m_scrollContainerLayer)
>+        return;
>+
>+    m_scrollContainerLayer = layerRepresentation;
>+    setPropertyChanged(ScrollContainerLayer);
>+}
>+
> void ScrollingStateScrollingNode::setScrolledContentsLayer(const LayerRepresentation& layerRepresentation)
> {
>     if (layerRepresentation == m_scrolledContentsLayer)
>@@ -290,8 +302,12 @@ void ScrollingStateScrollingNode::dumpPr
>     if (m_expectsWheelEventTestTrigger)
>         ts.dumpProperty("expects wheel event test trigger", m_expectsWheelEventTestTrigger);
> 
>-    if ((behavior & ScrollingStateTreeAsTextBehaviorIncludeLayerIDs) && m_scrolledContentsLayer.layerID())
>-        ts.dumpProperty("scrolled contents layer", m_scrolledContentsLayer.layerID());
>+    if (behavior & ScrollingStateTreeAsTextBehaviorIncludeLayerIDs) {
>+        if (m_scrollContainerLayer.layerID())
>+            ts.dumpProperty("scroll container layer", m_scrollContainerLayer.layerID());
>+        if (m_scrolledContentsLayer.layerID())
>+            ts.dumpProperty("scrolled contents layer", m_scrolledContentsLayer.layerID());
>+    }
> }
> 
> } // namespace WebCore
>Index: Source/WebCore/page/scrolling/ScrollingStateScrollingNode.h
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingStateScrollingNode.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingStateScrollingNode.h	(working copy)
>@@ -56,6 +56,7 @@ public:
>         CurrentVerticalSnapOffsetIndex,
> #endif
>         ExpectsWheelEventTestTrigger,
>+        ScrollContainerLayer,
>         ScrolledContentsLayer,
>         NumScrollingStateNodeBits // This must remain at the last position.
>     };
>@@ -108,6 +109,9 @@ public:
>     bool expectsWheelEventTestTrigger() const { return m_expectsWheelEventTestTrigger; }
>     WEBCORE_EXPORT void setExpectsWheelEventTestTrigger(bool);
> 
>+    const LayerRepresentation& scrollContainerLayer() const { return m_scrollContainerLayer; }
>+    WEBCORE_EXPORT void setScrollContainerLayer(const LayerRepresentation&);
>+
>     // This is a layer with the contents that move.
>     const LayerRepresentation& scrolledContentsLayer() const { return m_scrolledContentsLayer; }
>     WEBCORE_EXPORT void setScrolledContentsLayer(const LayerRepresentation&);
>@@ -134,6 +138,7 @@ private:
>     unsigned m_currentVerticalSnapPointIndex { 0 };
> #endif
>     ScrollableAreaParameters m_scrollableAreaParameters;
>+    LayerRepresentation m_scrollContainerLayer;
>     LayerRepresentation m_scrolledContentsLayer;
>     bool m_requestedScrollPositionRepresentsProgrammaticScroll { false };
>     bool m_expectsWheelEventTestTrigger { false };
>Index: Source/WebCore/page/scrolling/ScrollingTree.cpp
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingTree.cpp	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingTree.cpp	(working copy)
>@@ -154,12 +154,12 @@ void ScrollingTree::commitTreeState(std:
>     if (rootNode
>         && (rootStateNodeChanged
>             || rootNode->hasChangedProperty(ScrollingStateFrameScrollingNode::EventTrackingRegion)
>-            || rootNode->hasChangedProperty(ScrollingStateNode::ScrollLayer)
>+            || rootNode->hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer)
>             || rootNode->hasChangedProperty(ScrollingStateFrameScrollingNode::VisualViewportEnabled)
>             || rootNode->hasChangedProperty(ScrollingStateFrameScrollingNode::AsyncFrameOrOverflowScrollingEnabled))) {
>         LockHolder lock(m_mutex);
> 
>-        if (rootStateNodeChanged || rootNode->hasChangedProperty(ScrollingStateNode::ScrollLayer))
>+        if (rootStateNodeChanged || rootNode->hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>             m_mainFrameScrollPosition = FloatPoint();
> 
>         if (rootStateNodeChanged || rootNode->hasChangedProperty(ScrollingStateFrameScrollingNode::EventTrackingRegion))
>Index: Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.cpp	(working copy)
>@@ -96,6 +96,12 @@ void ScrollingTreeScrollingNode::commitS
> 
>     if (state.hasChangedProperty(ScrollingStateScrollingNode::ExpectsWheelEventTestTrigger))
>         m_expectsWheelEventTestTrigger = state.expectsWheelEventTestTrigger();
>+
>+    if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>+        m_scrollContainerLayer = state.scrollContainerLayer();
>+
>+    if (state.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>+        m_scrolledContentsLayer = state.scrolledContentsLayer();
> }
> 
> void ScrollingTreeScrollingNode::commitStateAfterChildren(const ScrollingStateNode& stateNode)
>Index: Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h
>===================================================================
>--- Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/ScrollingTreeScrollingNode.h	(working copy)
>@@ -111,6 +111,9 @@ protected:
> 
>     bool expectsWheelEventTestTrigger() const { return m_expectsWheelEventTestTrigger; }
> 
>+    CALayer *scrollContainerLayer() const { return m_scrollContainerLayer.get(); }
>+    CALayer *scrolledContentsLayer() const { return m_scrolledContentsLayer.get(); }
>+
>     WEBCORE_EXPORT LayoutPoint parentToLocalPoint(LayoutPoint) const override;
>     WEBCORE_EXPORT LayoutPoint localToContentsPoint(LayoutPoint) const override;
> 
>@@ -131,6 +134,9 @@ private:
> #endif
>     ScrollableAreaParameters m_scrollableAreaParameters;
>     bool m_expectsWheelEventTestTrigger { false };
>+
>+    RetainPtr<CALayer> m_scrollContainerLayer;
>+    RetainPtr<CALayer> m_scrolledContentsLayer;
> };
> 
> } // namespace WebCore
>Index: Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h
>===================================================================
>--- Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.h	(working copy)
>@@ -61,12 +61,9 @@ protected:
>     FloatPoint minimumScrollPosition() const override;
>     FloatPoint maximumScrollPosition() const override;
> 
>-    CALayer *scrollLayer() const;
>-
> private:
>     void updateChildNodesAfterScroll(const FloatPoint&);
> 
>-    RetainPtr<CALayer> m_scrollLayer;
>     RetainPtr<CALayer> m_counterScrollingLayer;
>     RetainPtr<CALayer> m_headerLayer;
>     RetainPtr<CALayer> m_footerLayer;
>Index: Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm
>===================================================================
>--- Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm	(revision 240855)
>+++ Source/WebCore/page/scrolling/ios/ScrollingTreeFrameScrollingNodeIOS.mm	(working copy)
>@@ -59,9 +59,6 @@ void ScrollingTreeFrameScrollingNodeIOS:
>     
>     const auto& scrollingStateNode = downcast<ScrollingStateFrameScrollingNode>(stateNode);
> 
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>-        m_scrollLayer = scrollingStateNode.layer();
>-
>     if (scrollingStateNode.hasChangedProperty(ScrollingStateFrameScrollingNode::CounterScrollingLayer))
>         m_counterScrollingLayer = scrollingStateNode.counterScrollingLayer();
> 
>@@ -78,7 +75,7 @@ void ScrollingTreeFrameScrollingNodeIOS:
>             if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::RequestedScrollPosition))
>                 m_probableMainThreadScrollPosition = scrollingStateNode.requestedScrollPosition();
>             else {
>-                CGPoint scrollLayerPosition = m_scrollLayer.get().position;
>+                CGPoint scrollLayerPosition = scrolledContentsLayer().position;
>                 m_probableMainThreadScrollPosition = IntPoint(-scrollLayerPosition.x, -scrollLayerPosition.y);
>             }
>         }
>@@ -106,7 +103,7 @@ FloatPoint ScrollingTreeFrameScrollingNo
>     if (shouldUpdateScrollLayerPositionSynchronously())
>         return m_probableMainThreadScrollPosition;
> 
>-    return -m_scrollLayer.get().position;
>+    return -scrolledContentsLayer().position;
> }
> 
> void ScrollingTreeFrameScrollingNodeIOS::setScrollPosition(const FloatPoint& scrollPosition)
>@@ -130,7 +127,7 @@ void ScrollingTreeFrameScrollingNodeIOS:
> void ScrollingTreeFrameScrollingNodeIOS::setScrollLayerPosition(const FloatPoint& scrollPosition, const FloatRect&)
> {
>     ASSERT(!shouldUpdateScrollLayerPositionSynchronously());
>-    [m_scrollLayer setPosition:-scrollPosition];
>+    [scrolledContentsLayer() setPosition:-scrollPosition];
> 
>     updateChildNodesAfterScroll(scrollPosition);
> }
>@@ -220,11 +217,6 @@ FloatPoint ScrollingTreeFrameScrollingNo
>     return position;
> }
> 
>-CALayer *ScrollingTreeFrameScrollingNodeIOS::scrollLayer() const
>-{
>-    return m_scrollLayer.get();
>-}
>-
> } // namespace WebCore
> 
> #endif // ENABLE(ASYNC_SCROLLING) && PLATFORM(IOS_FAMILY)
>Index: Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.mm
>===================================================================
>--- Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.mm	(revision 240855)
>+++ Source/WebCore/page/scrolling/mac/ScrollingTreeFixedNode.mm	(working copy)
>@@ -56,7 +56,7 @@ void ScrollingTreeFixedNode::commitState
> {
>     const ScrollingStateFixedNode& fixedStateNode = downcast<ScrollingStateFixedNode>(stateNode);
> 
>-    if (fixedStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>+    if (fixedStateNode.hasChangedProperty(ScrollingStateNode::Layer))
>         m_layer = fixedStateNode.layer();
> 
>     if (stateNode.hasChangedProperty(ScrollingStateFixedNode::ViewportConstraints))
>Index: Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h
>===================================================================
>--- Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.h	(working copy)
>@@ -69,7 +69,6 @@ protected:
>     unsigned exposedUnfilledArea() const;
> 
> private:
>-    RetainPtr<CALayer> m_scrollLayer;
>     RetainPtr<CALayer> m_rootContentsLayer;
>     RetainPtr<CALayer> m_counterScrollingLayer;
>     RetainPtr<CALayer> m_insetClipLayer;
>Index: Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm
>===================================================================
>--- Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm	(revision 240855)
>+++ Source/WebCore/page/scrolling/mac/ScrollingTreeFrameScrollingNodeMac.mm	(working copy)
>@@ -100,9 +100,6 @@ void ScrollingTreeFrameScrollingNodeMac:
>     ScrollingTreeFrameScrollingNode::commitStateBeforeChildren(stateNode);
>     const auto& scrollingStateNode = downcast<ScrollingStateFrameScrollingNode>(stateNode);
> 
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>-        m_scrollLayer = scrollingStateNode.layer();
>-
>     if (scrollingStateNode.hasChangedProperty(ScrollingStateFrameScrollingNode::RootContentsLayer))
>         m_rootContentsLayer = scrollingStateNode.rootContentsLayer();
> 
>@@ -135,7 +132,7 @@ void ScrollingTreeFrameScrollingNodeMac:
>             if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::RequestedScrollPosition))
>                 m_probableMainThreadScrollPosition = scrollingStateNode.requestedScrollPosition();
>             else {
>-                CGPoint scrollLayerPosition = m_scrollLayer.get().position;
>+                CGPoint scrollLayerPosition = scrolledContentsLayer().position;
>                 m_probableMainThreadScrollPosition = FloatPoint(-scrollLayerPosition.x, -scrollLayerPosition.y);
>             }
>         }
>@@ -173,7 +170,7 @@ void ScrollingTreeFrameScrollingNodeMac:
>     if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::RequestedScrollPosition))
>         setScrollPosition(scrollingStateNode.requestedScrollPosition());
> 
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer)
>+    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer)
>         || scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::TotalContentsSize)
>         || scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollableAreaSize))
>         updateMainFramePinState(scrollPosition());
>@@ -221,7 +218,7 @@ FloatPoint ScrollingTreeFrameScrollingNo
>     if (shouldUpdateScrollLayerPositionSynchronously())
>         return m_probableMainThreadScrollPosition;
> 
>-    return -m_scrollLayer.get().position;
>+    return -scrolledContentsLayer().position;
> }
> 
> void ScrollingTreeFrameScrollingNodeMac::setScrollPosition(const FloatPoint& scrollPosition)
>@@ -269,7 +266,7 @@ void ScrollingTreeFrameScrollingNodeMac:
> {
>     ASSERT(!shouldUpdateScrollLayerPositionSynchronously());
> 
>-    m_scrollLayer.get().position = -position;
>+    scrolledContentsLayer().position = -position;
> 
>     FloatRect visibleContentRect(position, scrollableAreaSize());
>     FloatRect fixedPositionRect;
>@@ -384,7 +381,7 @@ unsigned ScrollingTreeFrameScrollingNode
>     Region paintedVisibleTiles;
> 
>     Deque<CALayer*> layerQueue;
>-    layerQueue.append(m_scrollLayer.get());
>+    layerQueue.append(scrolledContentsLayer());
>     PlatformLayerList tiles;
> 
>     while (!layerQueue.isEmpty() && tiles.isEmpty()) {
>Index: Source/WebCore/page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.h
>===================================================================
>--- Source/WebCore/page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.h	(revision 240855)
>+++ Source/WebCore/page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.h	(working copy)
>@@ -58,11 +58,6 @@ private:
> 
>     ScrollingEventResult handleWheelEvent(const PlatformWheelEvent&) override;
> 
>-
>-    RetainPtr<CALayer> m_scrollLayer;
>-    RetainPtr<CALayer> m_scrolledContentsLayer;
>-
>-
>     ScrollingTreeScrollingNodeDelegateMac m_delegate;
> 
> };
>Index: Source/WebCore/page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.mm
>===================================================================
>--- Source/WebCore/page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.mm	(revision 240855)
>+++ Source/WebCore/page/scrolling/mac/ScrollingTreeOverflowScrollingNodeMac.mm	(working copy)
>@@ -54,13 +54,7 @@ void ScrollingTreeOverflowScrollingNodeM
> {
>     ScrollingTreeOverflowScrollingNode::commitStateBeforeChildren(stateNode);
>     const auto& scrollingStateNode = downcast<ScrollingStateOverflowScrollingNode>(stateNode);
>-
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>-        m_scrollLayer = scrollingStateNode.layer();
>-
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>-        m_scrolledContentsLayer = scrollingStateNode.scrolledContentsLayer();
>-
>+    UNUSED_PARAM(scrollingStateNode);
>     // FIXME: Scroll snap data.
> }
> 
>@@ -108,7 +102,7 @@ void ScrollingTreeOverflowScrollingNodeM
> 
> FloatPoint ScrollingTreeOverflowScrollingNodeMac::scrollPosition() const
> {
>-    return -m_scrolledContentsLayer.get().position;
>+    return -scrolledContentsLayer().position;
> }
> 
> void ScrollingTreeOverflowScrollingNodeMac::setScrollPosition(const FloatPoint& scrollPosition)
>@@ -130,7 +124,7 @@ void ScrollingTreeOverflowScrollingNodeM
> 
> void ScrollingTreeOverflowScrollingNodeMac::setScrollLayerPosition(const FloatPoint& scrollPosition, const FloatRect& fixedPositionRect)
> {
>-    m_scrolledContentsLayer.get().position = -scrollPosition;
>+    scrolledContentsLayer().position = -scrollPosition;
>     if (!m_children)
>         return;
> 
>Index: Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm
>===================================================================
>--- Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm	(revision 240855)
>+++ Source/WebCore/page/scrolling/mac/ScrollingTreeStickyNode.mm	(working copy)
>@@ -58,7 +58,7 @@ void ScrollingTreeStickyNode::commitStat
> {
>     const ScrollingStateStickyNode& stickyStateNode = downcast<ScrollingStateStickyNode>(stateNode);
> 
>-    if (stickyStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>+    if (stickyStateNode.hasChangedProperty(ScrollingStateNode::Layer))
>         m_layer = stickyStateNode.layer();
> 
>     if (stateNode.hasChangedProperty(ScrollingStateStickyNode::ViewportConstraints))
>Index: Source/WebCore/rendering/RenderLayerCompositor.cpp
>===================================================================
>--- Source/WebCore/rendering/RenderLayerCompositor.cpp	(revision 240855)
>+++ Source/WebCore/rendering/RenderLayerCompositor.cpp	(working copy)
>@@ -544,19 +544,22 @@ void RenderLayerCompositor::didChangePla
> 
>     auto* backing = layer.backing();
>     if (auto nodeID = backing->scrollingNodeIDForRole(ScrollCoordinationRole::ViewportConstrained))
>-        scrollingCoordinator->setNodeLayers(nodeID, backing->graphicsLayer());
>+        scrollingCoordinator->setNodeLayers(nodeID, { backing->graphicsLayer() });
> 
>     if (auto nodeID = backing->scrollingNodeIDForRole(ScrollCoordinationRole::Scrolling)) {
>         // FIXME: would be nice to not have to special-case the root.
>+        ScrollingCoordinator::NodeLayers nodeLayers;
>         if (layer.isRenderViewLayer()) {
>-            // FIXME: Reorganize the layers and pass the scrolledContentsLayer.
>-            scrollingCoordinator->setNodeLayers(nodeID, m_scrollLayer.get(), nullptr, fixedRootBackgroundLayer(), clipLayer(), m_rootContentsLayer.get());
>+            // FIXME: Reorganize the layers and pass the scrollContainerLayer.
>+            nodeLayers = { nullptr, nullptr, m_scrollLayer.get(), fixedRootBackgroundLayer(), clipLayer(), m_rootContentsLayer.get() };
>         } else
>-            scrollingCoordinator->setNodeLayers(nodeID, backing->scrollingLayer(), backing->scrollingContentsLayer());
>+            nodeLayers = { layer.backing()->graphicsLayer(), backing->scrollingLayer(), backing->scrollingContentsLayer() };
>+
>+        scrollingCoordinator->setNodeLayers(nodeID, nodeLayers);
>     }
> 
>     if (auto nodeID = backing->scrollingNodeIDForRole(ScrollCoordinationRole::FrameHosting))
>-        scrollingCoordinator->setNodeLayers(nodeID, backing->graphicsLayer());
>+        scrollingCoordinator->setNodeLayers(nodeID, { backing->graphicsLayer() });
> }
> 
> void RenderLayerCompositor::didPaintBacking(RenderLayerBacking*)
>@@ -3905,7 +3908,7 @@ ScrollingNodeID RenderLayerCompositor::u
>     LOG_WITH_STREAM(Compositing, stream << "Registering ViewportConstrained " << nodeType << " node " << newNodeID << " (layer " << layer.backing()->graphicsLayer()->primaryLayerID() << ") as child of " << treeState.parentNodeID.valueOr(0));
> 
>     if (changes & ScrollingNodeChangeFlags::Layer)
>-        scrollingCoordinator->setNodeLayers(newNodeID, layer.backing()->graphicsLayer());
>+        scrollingCoordinator->setNodeLayers(newNodeID, { layer.backing()->graphicsLayer() });
> 
>     if (changes & ScrollingNodeChangeFlags::LayerGeometry) {
>         switch (nodeType) {
>@@ -4009,7 +4012,7 @@ ScrollingNodeID RenderLayerCompositor::u
>         }
> 
>         if (changes & ScrollingNodeChangeFlags::Layer)
>-            scrollingCoordinator->setNodeLayers(newNodeID, m_scrollLayer.get(), nullptr, fixedRootBackgroundLayer(), clipLayer(), m_rootContentsLayer.get());
>+            scrollingCoordinator->setNodeLayers(newNodeID, { nullptr, nullptr, m_scrollLayer.get(), fixedRootBackgroundLayer(), clipLayer(), m_rootContentsLayer.get() });
> 
>         if (changes & ScrollingNodeChangeFlags::LayerGeometry) {
>             ScrollingCoordinator::ScrollingGeometry scrollingGeometry;
>@@ -4024,7 +4027,7 @@ ScrollingNodeID RenderLayerCompositor::u
>         }
>         
>         if (changes & ScrollingNodeChangeFlags::Layer)
>-            scrollingCoordinator->setNodeLayers(newNodeID, layer.backing()->scrollingLayer(), layer.backing()->scrollingContentsLayer());
>+            scrollingCoordinator->setNodeLayers(newNodeID, { layer.backing()->graphicsLayer(), layer.backing()->scrollingLayer(), layer.backing()->scrollingContentsLayer() });
> 
>         if (changes & ScrollingNodeChangeFlags::LayerGeometry && treeState.parentNodeID) {
>             RenderLayer* scrollingAncestorLayer = m_scrollingNodeToLayerMap.get(treeState.parentNodeID.value());
>@@ -4048,7 +4051,7 @@ ScrollingNodeID RenderLayerCompositor::u
>     }
> 
>     if (changes & ScrollingNodeChangeFlags::Layer)
>-        scrollingCoordinator->setNodeLayers(newNodeID, layer.backing()->graphicsLayer());
>+        scrollingCoordinator->setNodeLayers(newNodeID, { layer.backing()->graphicsLayer() });
> 
>     if (changes & ScrollingNodeChangeFlags::LayerGeometry && treeState.parentNodeID) {
>         RenderLayer* scrollingAncestorLayer = m_scrollingNodeToLayerMap.get(treeState.parentNodeID.value());
>Index: Source/WebKit/ChangeLog
>===================================================================
>--- Source/WebKit/ChangeLog	(revision 240855)
>+++ Source/WebKit/ChangeLog	(working copy)
>@@ -1,3 +1,28 @@
>+2019-02-01  Antti Koivisto  <antti@apple.com>
>+
>+        Don't use base layer() as the scroll layer in scrolling tree.
>+        https://bugs.webkit.org/show_bug.cgi?id=194160
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp:
>+        (ArgumentCoder<ScrollingStateNode>::encode):
>+        (ArgumentCoder<ScrollingStateNode>::decode):
>+        (ArgumentCoder<ScrollingStateScrollingNode>::encode):
>+        (ArgumentCoder<ScrollingStateScrollingNode>::decode):
>+        (WebKit::dump):
>+        * UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp:
>+        (WebKit::RemoteScrollingCoordinatorProxy::connectStateNodeLayers):
>+        * UIProcess/RemoteLayerTree/ios/RemoteScrollingCoordinatorProxyIOS.mm:
>+        (WebKit::RemoteScrollingCoordinatorProxy::connectStateNodeLayers):
>+        * UIProcess/RemoteLayerTree/ios/ScrollingTreeFrameScrollingNodeRemoteIOS.mm:
>+        (WebKit::ScrollingTreeFrameScrollingNodeRemoteIOS::commitStateBeforeChildren):
>+        * UIProcess/RemoteLayerTree/ios/ScrollingTreeOverflowScrollingNodeIOS.mm:
>+        (WebKit::ScrollingTreeOverflowScrollingNodeIOS::commitStateBeforeChildren):
>+        * UIProcess/RemoteLayerTree/ios/ScrollingTreeScrollingNodeDelegateIOS.mm:
>+        (WebKit::ScrollingTreeScrollingNodeDelegateIOS::commitStateBeforeChildren):
>+        (WebKit::ScrollingTreeScrollingNodeDelegateIOS::commitStateAfterChildren):
>+
> 2019-02-01  Michael Catanzaro  <mcatanzaro@igalia.com>
> 
>         [SOUP] Improve use of PAL::SessionID in WebKitCookieManager
>Index: Source/WebKit/Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp
>===================================================================
>--- Source/WebKit/Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp	(revision 240855)
>+++ Source/WebKit/Shared/RemoteLayerTree/RemoteScrollingCoordinatorTransaction.cpp	(working copy)
>@@ -90,7 +90,7 @@ void ArgumentCoder<ScrollingStateNode>::
>     encoder << node.parentNodeID();
>     encoder << node.changedProperties();
>     
>-    if (node.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>+    if (node.hasChangedProperty(ScrollingStateNode::Layer))
>         encoder << static_cast<GraphicsLayer::PlatformLayerID>(node.layer());
> }
> 
>@@ -102,7 +102,7 @@ bool ArgumentCoder<ScrollingStateNode>::
>         return false;
> 
>     node.setChangedProperties(changedProperties);
>-    if (node.hasChangedProperty(ScrollingStateNode::ScrollLayer)) {
>+    if (node.hasChangedProperty(ScrollingStateNode::Layer)) {
>         GraphicsLayer::PlatformLayerID layerID;
>         if (!decoder.decode(layerID))
>             return false;
>@@ -141,6 +141,8 @@ void ArgumentCoder<ScrollingStateScrolli
>     SCROLLING_NODE_ENCODE(ScrollingStateScrollingNode::RequestedScrollPosition, requestedScrollPosition)
>     SCROLLING_NODE_ENCODE(ScrollingStateScrollingNode::RequestedScrollPosition, requestedScrollPositionRepresentsProgrammaticScroll)
> 
>+    if (node.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>+        encoder << static_cast<GraphicsLayer::PlatformLayerID>(node.scrollContainerLayer());
>     if (node.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>         encoder << static_cast<GraphicsLayer::PlatformLayerID>(node.scrolledContentsLayer());
> }
>@@ -238,6 +240,13 @@ bool ArgumentCoder<ScrollingStateScrolli
>         node.setRequestedScrollPosition(scrollPosition, representsProgrammaticScroll);
>     }
> 
>+    if (node.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer)) {
>+        GraphicsLayer::PlatformLayerID layerID;
>+        if (!decoder.decode(layerID))
>+            return false;
>+        node.setScrollContainerLayer(layerID);
>+    }
>+
>     if (node.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer)) {
>         GraphicsLayer::PlatformLayerID layerID;
>         if (!decoder.decode(layerID))
>@@ -514,6 +523,9 @@ static void dump(TextStream& ts, const S
>         ts.dumpProperty("requested-scroll-position-is-programatic", node.requestedScrollPositionRepresentsProgrammaticScroll());
>     }
> 
>+    if (!changedPropertiesOnly || node.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>+        ts.dumpProperty("scroll-container-layer", static_cast<GraphicsLayer::PlatformLayerID>(node.scrollContainerLayer()));
>+
>     if (!changedPropertiesOnly || node.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>         ts.dumpProperty("scrolled-contents-layer", static_cast<GraphicsLayer::PlatformLayerID>(node.scrolledContentsLayer()));
> }
>@@ -601,7 +613,7 @@ static void dump(TextStream& ts, const S
> {
>     ts.dumpProperty("type", node.nodeType());
> 
>-    if (!changedPropertiesOnly || node.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>+    if (!changedPropertiesOnly || node.hasChangedProperty(ScrollingStateNode::Layer))
>         ts.dumpProperty("layer", static_cast<GraphicsLayer::PlatformLayerID>(node.layer()));
>     
>     switch (node.nodeType()) {
>Index: Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp
>===================================================================
>--- Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp	(revision 240855)
>+++ Source/WebKit/UIProcess/RemoteLayerTree/RemoteScrollingCoordinatorProxy.cpp	(working copy)
>@@ -99,7 +99,7 @@ void RemoteScrollingCoordinatorProxy::co
> void RemoteScrollingCoordinatorProxy::connectStateNodeLayers(ScrollingStateTree& stateTree, const RemoteLayerTreeHost& layerTreeHost)
> {
>     for (auto& currNode : stateTree.nodeMap().values()) {
>-        if (currNode->hasChangedProperty(ScrollingStateNode::ScrollLayer))
>+        if (currNode->hasChangedProperty(ScrollingStateNode::Layer))
>             currNode->setLayer(layerTreeHost.layerForID(currNode->layer()));
> 
>         switch (currNode->nodeType()) {
>@@ -107,6 +107,9 @@ void RemoteScrollingCoordinatorProxy::co
>         case ScrollingNodeType::Subframe: {
>             ScrollingStateFrameScrollingNode& scrollingStateNode = downcast<ScrollingStateFrameScrollingNode>(*currNode);
>             
>+            if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>+                scrollingStateNode.setScrollContainerLayer(layerTreeHost.layerForID(scrollingStateNode.scrollContainerLayer()));
>+
>             if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>                 scrollingStateNode.setScrolledContentsLayer(layerTreeHost.layerForID(scrollingStateNode.scrolledContentsLayer()));
> 
>@@ -135,6 +138,8 @@ void RemoteScrollingCoordinatorProxy::co
>         }
>         case ScrollingNodeType::Overflow: {
>             ScrollingStateOverflowScrollingNode& scrollingStateNode = downcast<ScrollingStateOverflowScrollingNode>(*currNode);
>+            if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>+                scrollingStateNode.setScrollContainerLayer(layerTreeHost.layerForID(scrollingStateNode.scrollContainerLayer()));
> 
>             if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>                 scrollingStateNode.setScrolledContentsLayer(layerTreeHost.layerForID(scrollingStateNode.scrolledContentsLayer()));
>Index: Source/WebKit/UIProcess/RemoteLayerTree/ios/RemoteScrollingCoordinatorProxyIOS.mm
>===================================================================
>--- Source/WebKit/UIProcess/RemoteLayerTree/ios/RemoteScrollingCoordinatorProxyIOS.mm	(revision 240855)
>+++ Source/WebKit/UIProcess/RemoteLayerTree/ios/RemoteScrollingCoordinatorProxyIOS.mm	(working copy)
>@@ -50,13 +50,16 @@ using namespace WebCore;
> void RemoteScrollingCoordinatorProxy::connectStateNodeLayers(ScrollingStateTree& stateTree, const RemoteLayerTreeHost& layerTreeHost)
> {
>     for (auto& currNode : stateTree.nodeMap().values()) {
>+        if (currNode->hasChangedProperty(ScrollingStateNode::Layer))
>+            currNode->setLayer(layerTreeHost.layerForID(currNode->layer()));
>+        
>         switch (currNode->nodeType()) {
>         case ScrollingNodeType::Overflow: {
>             ScrollingStateOverflowScrollingNode& scrollingStateNode = downcast<ScrollingStateOverflowScrollingNode>(*currNode);
>-            
>-            if (scrollingStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>-                scrollingStateNode.setLayer(layerTreeHost.layerForID(scrollingStateNode.layer()));
>-            
>+
>+            if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>+                scrollingStateNode.setScrollContainerLayer(layerTreeHost.layerForID(scrollingStateNode.scrollContainerLayer()));
>+
>             if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>                 scrollingStateNode.setScrolledContentsLayer(layerTreeHost.layerForID(scrollingStateNode.scrolledContentsLayer()));
>             break;
>@@ -64,9 +67,9 @@ void RemoteScrollingCoordinatorProxy::co
>         case ScrollingNodeType::MainFrame:
>         case ScrollingNodeType::Subframe: {
>             ScrollingStateFrameScrollingNode& scrollingStateNode = downcast<ScrollingStateFrameScrollingNode>(*currNode);
>-            
>-            if (scrollingStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>-                scrollingStateNode.setLayer(layerTreeHost.layerForID(scrollingStateNode.layer()));
>+
>+            if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>+                scrollingStateNode.setScrollContainerLayer(layerTreeHost.layerForID(scrollingStateNode.scrollContainerLayer()));
> 
>             if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>                 scrollingStateNode.setScrolledContentsLayer(layerTreeHost.layerForID(scrollingStateNode.scrolledContentsLayer()));
>@@ -85,8 +88,6 @@ void RemoteScrollingCoordinatorProxy::co
>         case ScrollingNodeType::Fixed:
>         case ScrollingNodeType::Sticky:
>         case ScrollingNodeType::FrameHosting:
>-            if (currNode->hasChangedProperty(ScrollingStateNode::ScrollLayer))
>-                currNode->setLayer(layerTreeHost.layerForID(currNode->layer()));
>             break;
>         }
>     }
>Index: Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeFrameScrollingNodeRemoteIOS.mm
>===================================================================
>--- Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeFrameScrollingNodeRemoteIOS.mm	(revision 240855)
>+++ Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeFrameScrollingNodeRemoteIOS.mm	(working copy)
>@@ -52,8 +52,9 @@ void ScrollingTreeFrameScrollingNodeRemo
> {
>     ScrollingTreeFrameScrollingNodeIOS::commitStateBeforeChildren(stateNode);
> 
>-    if (stateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollLayer)) {
>-        if (scrollLayer() && [[scrollLayer() delegate] isKindOfClass:[UIScrollView self]])
>+    // FIXME: Should be ScrollContainerLayer.
>+    if (stateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer)) {
>+        if (scrolledContentsLayer() && [[scrolledContentsLayer() delegate] isKindOfClass:[UIScrollView self]])
>             m_scrollingNodeDelegate = std::make_unique<ScrollingTreeScrollingNodeDelegateIOS>(*this);
>         else
>             m_scrollingNodeDelegate = nullptr;
>Index: Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeOverflowScrollingNodeIOS.mm
>===================================================================
>--- Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeOverflowScrollingNodeIOS.mm	(revision 240855)
>+++ Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeOverflowScrollingNodeIOS.mm	(working copy)
>@@ -53,7 +53,7 @@ ScrollingTreeOverflowScrollingNodeIOS::~
> 
> void ScrollingTreeOverflowScrollingNodeIOS::commitStateBeforeChildren(const WebCore::ScrollingStateNode& stateNode)
> {
>-    if (stateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollLayer))
>+    if (stateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer))
>         m_scrollingNodeDelegate->resetScrollViewDelegate();
> 
>     ScrollingTreeOverflowScrollingNode::commitStateBeforeChildren(stateNode);
>Index: Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeScrollingNodeDelegateIOS.mm
>===================================================================
>--- Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeScrollingNodeDelegateIOS.mm	(revision 240855)
>+++ Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeScrollingNodeDelegateIOS.mm	(working copy)
>@@ -194,17 +194,27 @@ void ScrollingTreeScrollingNodeDelegateI
> 
> void ScrollingTreeScrollingNodeDelegateIOS::commitStateBeforeChildren(const ScrollingStateScrollingNode& scrollingStateNode)
> {
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateNode::ScrollLayer))
>-        m_scrollLayer = scrollingStateNode.layer();
>+    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer)) {
>+        RetainPtr<CALayer> layer;
>+        layer = scrollingStateNode.scrollContainerLayer();
>+        if ([[layer delegate] isKindOfClass:[UIScrollView self]])
>+            m_scrollLayer = layer;
>+    }
> 
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer))
>-        m_scrolledContentsLayer = scrollingStateNode.scrolledContentsLayer();
>+    // FIMXE: ScrollContainerLayer should always be the UIScrollView layer.
>+    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer)) {
>+        RetainPtr<CALayer> layer;
>+        layer = scrollingStateNode.scrolledContentsLayer();
>+        if ([[layer delegate] isKindOfClass:[UIScrollView self]])
>+            m_scrollLayer = layer;
>+    }
> }
> 
> void ScrollingTreeScrollingNodeDelegateIOS::commitStateAfterChildren(const ScrollingStateScrollingNode& scrollingStateNode)
> {
>     SetForScope<bool> updatingChange(m_updatingFromStateNode, true);
>-    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollLayer)
>+    if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer)
>+        || scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer)
>         || scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::TotalContentsSize)
>         || scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ReachableContentsSize)
>         || scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollPosition)
>@@ -213,7 +223,8 @@ void ScrollingTreeScrollingNodeDelegateI
>         UIScrollView *scrollView = (UIScrollView *)[scrollLayer() delegate];
>         ASSERT([scrollView isKindOfClass:[UIScrollView self]]);
> 
>-        if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollLayer)) {
>+        if (scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrollContainerLayer)
>+            || scrollingStateNode.hasChangedProperty(ScrollingStateScrollingNode::ScrolledContentsLayer)) {
>             if (!m_scrollViewDelegate)
>                 m_scrollViewDelegate = adoptNS([[WKScrollingNodeScrollViewDelegate alloc] initWithScrollingTreeNodeDelegate:this]);
>

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Attachments on bug 194160: 360864 | 360869 | 360876 | 360878