Attachment 360352 Details for Bug 193691 – Patch

[patch] Patch

bug-193691-20190128102646.patch (text/plain), 26.04 KB, created by Jer Noble on 2019-01-28 10:26:47 PST

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Creator: Jer Noble

Created: 2019-01-28 10:26:47 PST

Size: 26.04 KB

patch

obsolete

>Subversion Revision: 240588
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index be0b10298aae75e3d17de54c2bfd16ed1e5e2052..28a635f4d1babb01af7ec9337a672541ee57eeaa 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,39 @@
>+2019-01-22  Jer Noble  <jer.noble@apple.com>
>+
>+        [Cocoa] Media elements will restart network buffering just before suspending
>+        https://bugs.webkit.org/show_bug.cgi?id=193691
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        API Test: WebKit.ProcessSuspendMediaBuffering
>+
>+        Allow the Page to suspend all media buffering in its child Documents.
>+
>+        * dom/Document.cpp:
>+        (WebCore::Document::suspendAllMediaBuffering):
>+        (WebCore::Document::resumeAllMediaBuffering):
>+        * dom/Document.h:
>+        * html/MediaElementSession.cpp:
>+        (WebCore::MediaElementSession::dataBufferingPermitted const):
>+        (WebCore::MediaElementSession::suspendBuffering):
>+        (WebCore::MediaElementSession::resumeBuffering):
>+        (WebCore::MediaElementSession::bufferingSuspended const):
>+        * html/MediaElementSession.h:
>+        * page/Page.cpp:
>+        (WebCore::Page::suspendAllMediaBuffering):
>+        (WebCore::Page::resumeAllMediaBuffering):
>+        * page/Page.h:
>+        (WebCore::Page::mediaPlaybackIsSuspended const):
>+        (WebCore::Page::mediaBufferingIsSuspended const):
>+        (WebCore::Page::mediaPlaybackIsSuspended): Deleted.
>+        * platform/audio/PlatformMediaSession.h:
>+        (WebCore::PlatformMediaSession::suspendBuffering):
>+        (WebCore::PlatformMediaSession::resumeBuffering):
>+        * platform/audio/PlatformMediaSessionManager.cpp:
>+        (WebCore::PlatformMediaSessionManager::suspendAllMediaBufferingForDocument):
>+        (WebCore::PlatformMediaSessionManager::resumeAllMediaBufferingForDocument):
>+        * platform/audio/PlatformMediaSessionManager.h:
>+
> 2019-01-28  Oriol Brufau  <obrufau@igalia.com>
> 
>         [css-logical] Reject unitless length quirk in 'inset' shorthand
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index e90a49d68ad6ee2f5a07cd88c41367e1905242a0..728672c1a2a165b4cb546eb0d5a6f992c1a366b5 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,35 @@
>+2019-01-22  Jer Noble  <jer.noble@apple.com>
>+
>+        [Cocoa] Media elements will restart network buffering just before suspending
>+        https://bugs.webkit.org/show_bug.cgi?id=193691
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        When the WebProcess receives a notification that the process is about to become
>+        suspended, it tells the MemoryPressureHandler to release all critical memory. This
>+        has the side effect of causing AVFoundation-backed media elements to dump their
>+        in-memory caches and start downloading media data again. Instead, media elements
>+        should all stop buffering media data during suspension. Add new testing SPI to
>+        simulate suspension and resume messages.
>+
>+        * UIProcess/API/Cocoa/WKWebView.mm:
>+        (-[WKWebView _processWillSuspendImminentlyForTesting]):
>+        (-[WKWebView _processDidResumeForTesting]):
>+        * UIProcess/API/Cocoa/WKWebViewPrivate.h:
>+        * UIProcess/WebProcessProxy.h:
>+        * UIProcess/ios/WKInkPickerView.mm:
>+        * WebProcess/WebPage/WebPage.cpp:
>+        (WebKit::WebPage::suspendAllMediaBuffering):
>+        (WebKit::WebPage::resumeAllMediaBuffering):
>+        * WebProcess/WebPage/WebPage.h:
>+        * WebProcess/WebProcess.cpp:
>+        (WebKit::WebProcess::actualPrepareToSuspend):
>+        (WebKit::WebProcess::cancelPrepareToSuspend):
>+        (WebKit::WebProcess::processDidResume):
>+        (WebKit::WebProcess::suspendAllMediaBuffering):
>+        (WebKit::WebProcess::resumeAllMediaBuffering):
>+        * WebProcess/WebProcess.h:
>+
> 2019-01-28  Antoine Quint  <graouts@apple.com>
> 
>         Limit user-agent interactions based on the touch-action property on iOS
>diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
>index 612c35fd454b8e17308938f45037125dbb550656..3af3fb94d38639f66742e70d6cc0d7732caf9879 100644
>--- a/Source/WebCore/dom/Document.cpp
>+++ b/Source/WebCore/dom/Document.cpp
>@@ -1741,6 +1741,18 @@ void Document::resumeAllMediaPlayback()
>     if (auto* platformMediaSessionManager = PlatformMediaSessionManager::sharedManagerIfExists())
>         platformMediaSessionManager->resumeAllMediaPlaybackForDocument(*this);
> }
>+
>+void Document::suspendAllMediaBuffering()
>+{
>+    if (auto* platformMediaSessionManager = PlatformMediaSessionManager::sharedManagerIfExists())
>+        platformMediaSessionManager->suspendAllMediaBufferingForDocument(*this);
>+}
>+
>+void Document::resumeAllMediaBuffering()
>+{
>+    if (auto* platformMediaSessionManager = PlatformMediaSessionManager::sharedManagerIfExists())
>+        platformMediaSessionManager->resumeAllMediaBufferingForDocument(*this);
>+}
> #endif
> 
> String Document::nodeName() const
>diff --git a/Source/WebCore/dom/Document.h b/Source/WebCore/dom/Document.h
>index 8e2878f4d15ab8515067a3aa5da3f25731102d03..1c8021e71314005d1ebc68e14846fb4758abe6ae 100644
>--- a/Source/WebCore/dom/Document.h
>+++ b/Source/WebCore/dom/Document.h
>@@ -1125,6 +1125,8 @@ public:
>     void stopAllMediaPlayback();
>     void suspendAllMediaPlayback();
>     void resumeAllMediaPlayback();
>+    void suspendAllMediaBuffering();
>+    void resumeAllMediaBuffering();
> #endif
> 
>     WEBCORE_EXPORT void setShouldCreateRenderers(bool);
>diff --git a/Source/WebCore/html/MediaElementSession.cpp b/Source/WebCore/html/MediaElementSession.cpp
>index 71ac9956883102752def4d877501226402645a6f..153415a6f86058b4660039745892d5bd4b663833 100644
>--- a/Source/WebCore/html/MediaElementSession.cpp
>+++ b/Source/WebCore/html/MediaElementSession.cpp
>@@ -379,6 +379,9 @@ bool MediaElementSession::dataBufferingPermitted() const
>     if (isSuspended())
>         return false;
> 
>+    if (bufferingSuspended())
>+        return false;
>+
>     if (state() == PlatformMediaSession::Playing)
>         return true;
> 
>@@ -785,6 +788,23 @@ void MediaElementSession::resetPlaybackSessionState()
>     addBehaviorRestriction(RequireUserGestureToControlControlsManager | RequirePlaybackToControlControlsManager);
> }
> 
>+void MediaElementSession::suspendBuffering()
>+{
>+    updateClientDataBuffering();
>+}
>+
>+void MediaElementSession::resumeBuffering()
>+{
>+    updateClientDataBuffering();
>+}
>+
>+bool MediaElementSession::bufferingSuspended() const
>+{
>+    if (auto* page = m_element.document().page())
>+        return page->mediaBufferingIsSuspended();
>+    return true;
>+}
>+
> bool MediaElementSession::allowsPictureInPicture() const
> {
>     return m_element.document().settings().allowsPictureInPictureMediaPlayback();
>diff --git a/Source/WebCore/html/MediaElementSession.h b/Source/WebCore/html/MediaElementSession.h
>index 597ba27729acc8f2e2e78caf964f5fc808e2a01e..ce058c6e11fe441c18de0652681cbaa4198147e1 100644
>--- a/Source/WebCore/html/MediaElementSession.h
>+++ b/Source/WebCore/html/MediaElementSession.h
>@@ -101,6 +101,10 @@ public:
> 
>     void resetPlaybackSessionState() override;
> 
>+    void suspendBuffering() override;
>+    void resumeBuffering() override;
>+    bool bufferingSuspended() const;
>+
>     // Restrictions to modify default behaviors.
>     enum BehaviorRestrictionFlags : unsigned {
>         NoRestrictions = 0,
>diff --git a/Source/WebCore/page/Page.cpp b/Source/WebCore/page/Page.cpp
>index 26a25819c1a7741d12cd964629ad15979986d0d0..646bd5f4452c4f4f17feebb554cef01a72874cfc 100644
>--- a/Source/WebCore/page/Page.cpp
>+++ b/Source/WebCore/page/Page.cpp
>@@ -1759,6 +1759,36 @@ void Page::resumeAllMediaPlayback()
> #endif
> }
> 
>+void Page::suspendAllMediaBuffering()
>+{
>+#if ENABLE(VIDEO)
>+    ASSERT(!m_mediaBufferingIsSuspended);
>+    if (m_mediaBufferingIsSuspended)
>+        return;
>+    m_mediaBufferingIsSuspended = true;
>+
>+    for (Frame* frame = &mainFrame(); frame; frame = frame->tree().traverseNext()) {
>+        if (auto* document = frame->document())
>+            document->suspendAllMediaBuffering();
>+    }
>+#endif
>+}
>+
>+void Page::resumeAllMediaBuffering()
>+{
>+#if ENABLE(VIDEO)
>+    ASSERT(m_mediaBufferingIsSuspended);
>+    if (!m_mediaBufferingIsSuspended)
>+        return;
>+    m_mediaBufferingIsSuspended = false;
>+
>+    for (Frame* frame = &mainFrame(); frame; frame = frame->tree().traverseNext()) {
>+        if (auto* document = frame->document())
>+            document->resumeAllMediaBuffering();
>+    }
>+#endif
>+}
>+
> #if ENABLE(MEDIA_SESSION)
> void Page::handleMediaEvent(MediaEventType eventType)
> {
>diff --git a/Source/WebCore/page/Page.h b/Source/WebCore/page/Page.h
>index 7f7b370bcae98ab957db4c50176dec29b7b4f926..fd23cad909d824400221a7fe115a3b94201b5fec 100644
>--- a/Source/WebCore/page/Page.h
>+++ b/Source/WebCore/page/Page.h
>@@ -609,7 +609,10 @@ public:
>     WEBCORE_EXPORT void stopAllMediaPlayback();
>     WEBCORE_EXPORT void suspendAllMediaPlayback();
>     WEBCORE_EXPORT void resumeAllMediaPlayback();
>-    bool mediaPlaybackIsSuspended() { return m_mediaPlaybackIsSuspended; }
>+    bool mediaPlaybackIsSuspended() const { return m_mediaPlaybackIsSuspended; }
>+    WEBCORE_EXPORT void suspendAllMediaBuffering();
>+    WEBCORE_EXPORT void resumeAllMediaBuffering();
>+    bool mediaBufferingIsSuspended() const { return m_mediaBufferingIsSuspended; }
> 
> #if ENABLE(MEDIA_SESSION)
>     WEBCORE_EXPORT void handleMediaEvent(MediaEventType);
>@@ -959,6 +962,7 @@ private:
> 
>     bool m_shouldEnableICECandidateFilteringByDefault { true };
>     bool m_mediaPlaybackIsSuspended { false };
>+    bool m_mediaBufferingIsSuspended { false };
> };
> 
> inline PageGroup& Page::group()
>diff --git a/Source/WebCore/platform/audio/PlatformMediaSession.h b/Source/WebCore/platform/audio/PlatformMediaSession.h
>index 25c177990cf2613f25fe0ad00d8812429b6da0f2..87e192f4fe3faac8cd64d374eed72f40d83697b6 100644
>--- a/Source/WebCore/platform/audio/PlatformMediaSession.h
>+++ b/Source/WebCore/platform/audio/PlatformMediaSession.h
>@@ -113,6 +113,9 @@ public:
> 
>     void pauseSession();
>     void stopSession();
>+
>+    virtual void suspendBuffering() { }
>+    virtual void resumeBuffering() { }
>     
> #if ENABLE(VIDEO)
>     uint64_t uniqueIdentifier() const;
>diff --git a/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp b/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp
>index 2050c5e082f3381b671802f835b07ec54e48c5d4..b9b079d9e1fd7ffffc2085337a0331f1f277058d 100644
>--- a/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp
>+++ b/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp
>@@ -437,6 +437,22 @@ void PlatformMediaSessionManager::resumeAllMediaPlaybackForDocument(const Docume
>     });
> }
> 
>+void PlatformMediaSessionManager::suspendAllMediaBufferingForDocument(const Document& document)
>+{
>+    forEachSession([&] (PlatformMediaSession& session, size_t) {
>+        if (session.client().hostingDocument() == &document)
>+            session.suspendBuffering();
>+    });
>+}
>+
>+void PlatformMediaSessionManager::resumeAllMediaBufferingForDocument(const Document& document)
>+{
>+    forEachSession([&] (PlatformMediaSession& session, size_t) {
>+        if (session.client().hostingDocument() == &document)
>+            session.resumeBuffering();
>+    });
>+}
>+
> void PlatformMediaSessionManager::forEachSession(const Function<void(PlatformMediaSession&, size_t)>& predicate) const
> {
>     ++m_iteratingOverSessions;
>diff --git a/Source/WebCore/platform/audio/PlatformMediaSessionManager.h b/Source/WebCore/platform/audio/PlatformMediaSessionManager.h
>index 065d94fedc895ad6edd5bdae20046cab2260d8f2..baf5dd8c7488111a0465413a6ba09d6203e00071 100644
>--- a/Source/WebCore/platform/audio/PlatformMediaSessionManager.h
>+++ b/Source/WebCore/platform/audio/PlatformMediaSessionManager.h
>@@ -81,6 +81,8 @@ public:
> 
>     void suspendAllMediaPlaybackForDocument(const Document&);
>     void resumeAllMediaPlaybackForDocument(const Document&);
>+    void suspendAllMediaBufferingForDocument(const Document&);
>+    void resumeAllMediaBufferingForDocument(const Document&);
> 
>     enum SessionRestrictionFlags {
>         NoRestrictions = 0,
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>index b987c9924b986f6402abc8851e3c8ada92da46ff..f15b1c1c81acad73b82eb0abc930f8cbb2027e50 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>@@ -7091,6 +7091,18 @@ - (_WKFrameHandle *)_mainFrame
>     return nil;
> }
> 
>+- (void)_processWillSuspendImminentlyForTesting
>+{
>+    if (_page)
>+        _page->process().sendProcessWillSuspendImminently();
>+}
>+
>+- (void)_processDidResumeForTesting
>+{
>+    if (_page)
>+        _page->process().sendProcessDidResume();
>+}
>+
> - (void)_denyNextUserMediaRequest
> {
> #if ENABLE(MEDIA_STREAM)
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h
>index 12b01e85d193601df1a2ba3e8411e4815cf7e477..46f5efd363cd3262120dfdd776c656836f095d79 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewPrivate.h
>@@ -547,6 +547,9 @@ typedef NS_OPTIONS(NSUInteger, _WKRectEdge) {
> @property (nonatomic, readonly) _WKInspector *_inspector WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
> @property (nonatomic, readonly) _WKFrameHandle *_mainFrame WK_API_AVAILABLE(macosx(WK_MAC_TBA), ios(WK_IOS_TBA));
> 
>+- (void)_processWillSuspendImminentlyForTesting;
>+- (void)_processDidResumeForTesting;
>+
> @end
> 
> #endif
>diff --git a/Source/WebKit/UIProcess/WebProcessProxy.h b/Source/WebKit/UIProcess/WebProcessProxy.h
>index 835686c63013cbcd9d03357b01757f81c40ebd02..0a6aedc8030b3c4511a2a8c3bdf6187a933397df 100644
>--- a/Source/WebKit/UIProcess/WebProcessProxy.h
>+++ b/Source/WebKit/UIProcess/WebProcessProxy.h
>@@ -252,6 +252,13 @@ public:
>     void shutDown();
>     void maybeShutDown();
> 
>+    // ProcessThrottlerClient
>+    void sendProcessWillSuspendImminently() override;
>+    void sendPrepareToSuspend() override;
>+    void sendCancelPrepareToSuspend() override;
>+    void sendProcessDidResume() override;
>+    void didSetAssertionState(AssertionState) override;
>+
> protected:
>     static uint64_t generatePageID();
>     WebProcessProxy(WebProcessPool&, WebsiteDataStore&, IsPrewarmed);
>@@ -321,13 +328,6 @@ private:
>     void didChangeIsResponsive() override;
>     bool mayBecomeUnresponsive() override;
> 
>-    // ProcessThrottlerClient
>-    void sendProcessWillSuspendImminently() override;
>-    void sendPrepareToSuspend() override;
>-    void sendCancelPrepareToSuspend() override;
>-    void sendProcessDidResume() override;
>-    void didSetAssertionState(AssertionState) override;
>-
>     // Implemented in generated WebProcessProxyMessageReceiver.cpp
>     void didReceiveWebProcessProxyMessage(IPC::Connection&, IPC::Decoder&);
>     void didReceiveSyncWebProcessProxyMessage(IPC::Connection&, IPC::Decoder&, std::unique_ptr<IPC::Encoder>&);
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.cpp b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>index d0b9753080c36138afb3453551c5aee7180827b8..ee82c927d6f47b351218670c85959f168172265e 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>@@ -680,6 +680,17 @@ void WebPage::resumeAllMediaPlayback()
>     m_page->resumeAllMediaPlayback();
> }
> 
>+void WebPage::suspendAllMediaBuffering()
>+{
>+    m_page->suspendAllMediaBuffering();
>+}
>+
>+void WebPage::resumeAllMediaBuffering()
>+{
>+    m_page->resumeAllMediaBuffering();
>+}
>+
>+
> void WebPage::reinitializeWebPage(WebPageCreationParameters&& parameters)
> {
>     ASSERT(m_drawingArea);
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.h b/Source/WebKit/WebProcess/WebPage/WebPage.h
>index e764f992e25179f3eb190981c6950443190f2031..a717e091a623c96dfb9a1607660db620cc14f54a 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.h
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.h
>@@ -1137,6 +1137,9 @@ public:
> 
>     void didReceiveWebPageMessage(IPC::Connection&, IPC::Decoder&);
> 
>+    void suspendAllMediaBuffering();
>+    void resumeAllMediaBuffering();
>+
> private:
>     WebPage(uint64_t pageID, WebPageCreationParameters&&);
> 
>diff --git a/Source/WebKit/WebProcess/WebProcess.cpp b/Source/WebKit/WebProcess/WebProcess.cpp
>index 67b894d78ca040215bdc9041135e3c40d4168b3e..960eec77adf4c346d8a80797a33628cc905ee0c8 100644
>--- a/Source/WebKit/WebProcess/WebProcess.cpp
>+++ b/Source/WebKit/WebProcess/WebProcess.cpp
>@@ -1379,6 +1379,10 @@ void WebProcess::actualPrepareToSuspend(ShouldAcknowledgeWhenReadyToSuspend shou
> {
>     SetForScope<bool> suspensionScope(m_isSuspending, true);
> 
>+#if ENABLE(VIDEO)
>+    suspendAllMediaBuffering();
>+#endif
>+
>     if (!m_suppressMemoryPressureHandler)
>         MemoryPressureHandler::singleton().releaseMemory(Critical::Yes, Synchronous::Yes);
> 
>@@ -1435,7 +1439,11 @@ void WebProcess::cancelPrepareToSuspend()
> #if PLATFORM(IOS_FAMILY)
>     accessibilityProcessSuspendedNotification(false);
> #endif
>-    
>+
>+#if ENABLE(VIDEO)
>+    resumeAllMediaBuffering();
>+#endif
>+
>     // If we've already finished cleaning up and sent ProcessReadyToSuspend, we
>     // shouldn't send DidCancelProcessSuspension; the UI process strictly expects one or the other.
>     if (!m_pageMarkingLayersAsVolatileCounter)
>@@ -1500,6 +1508,10 @@ void WebProcess::processDidResume()
> #if PLATFORM(IOS_FAMILY)
>     accessibilityProcessSuspendedNotification(false);
> #endif
>+
>+#if ENABLE(VIDEO)
>+    resumeAllMediaBuffering();
>+#endif
> }
> 
> void WebProcess::sendPrewarmInformation(const URL& url)
>@@ -1752,6 +1764,20 @@ void WebProcess::resetMockMediaDevices()
> }
> #endif
> 
>+#if ENABLE(VIDEO)
>+void WebProcess::suspendAllMediaBuffering()
>+{
>+    for (auto& page : m_pageMap.values())
>+        page->suspendAllMediaBuffering();
>+}
>+
>+void WebProcess::resumeAllMediaBuffering()
>+{
>+    for (auto& page : m_pageMap.values())
>+        page->resumeAllMediaBuffering();
>+}
>+#endif
>+
> void WebProcess::clearCurrentModifierStateForTesting()
> {
>     PlatformKeyboardEvent::setCurrentModifierState({ });
>diff --git a/Source/WebKit/WebProcess/WebProcess.h b/Source/WebKit/WebProcess/WebProcess.h
>index 8d0213394818150b50e22444f9ec2b3ec7c5675a..898d230531daa4f243b57cef6bc34a73d63887ec 100644
>--- a/Source/WebKit/WebProcess/WebProcess.h
>+++ b/Source/WebKit/WebProcess/WebProcess.h
>@@ -394,6 +394,11 @@ private:
> #endif
> #endif
> 
>+#if ENABLE(VIDEO)
>+    void suspendAllMediaBuffering();
>+    void resumeAllMediaBuffering();
>+#endif
>+
>     void clearCurrentModifierStateForTesting();
> 
>     RefPtr<WebConnectionToUIProcess> m_webConnection;
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index a59da2cd9cfe7c1b5771e03ccb437b442402e10d..d974836cd2f951b5a1877bab91a34ce4b07247da 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,14 @@
>+2019-01-22  Jer Noble  <jer.noble@apple.com>
>+
>+        [Cocoa] Media elements will restart network buffering just before suspending
>+        https://bugs.webkit.org/show_bug.cgi?id=193691
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
>+        * TestWebKitAPI/Tests/WebKitCocoa/ProcessSuspendMediaBuffering.mm: Added.
>+        (TEST):
>+
> 2018-11-06  Jer Noble  <jer.noble@apple.com>
> 
>         Add a git utility method that allows the caller to determine if a specific commitish is within a specified range of commits.
>diff --git a/Tools/TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj b/Tools/TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj
>index d4a28c1fd6bcd6c6cf22cea1c745e87c52e979ca..9278c943acce1bac5c7d3a00ae8933a35db292e6 100644
>--- a/Tools/TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj
>+++ b/Tools/TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj
>@@ -777,6 +777,7 @@
> 		CDA315981ED53651009F60D3 /* MediaPlaybackSleepAssertion.mm in Sources */ = {isa = PBXBuildFile; fileRef = CDA315961ED53651009F60D3 /* MediaPlaybackSleepAssertion.mm */; };
> 		CDA3159A1ED548F1009F60D3 /* MediaPlaybackSleepAssertion.html in Copy Resources */ = {isa = PBXBuildFile; fileRef = CDA315991ED540A5009F60D3 /* MediaPlaybackSleepAssertion.html */; };
> 		CDA3159D1ED5643F009F60D3 /* IOKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = CDA3159C1ED5643F009F60D3 /* IOKit.framework */; };
>+		CDA4438E21F7A47700379489 /* ProcessSuspendMediaBuffering.mm in Sources */ = {isa = PBXBuildFile; fileRef = CDA4438D21F7A47700379489 /* ProcessSuspendMediaBuffering.mm */; };
> 		CDB4115A1E0B00DB00EAD352 /* video-with-muted-audio.html in Copy Resources */ = {isa = PBXBuildFile; fileRef = CDB411591E09DA8E00EAD352 /* video-with-muted-audio.html */; };
> 		CDB5DFFF213610FA00D3E189 /* now-playing.html in Copy Resources */ = {isa = PBXBuildFile; fileRef = CDB5DFFE21360ED800D3E189 /* now-playing.html */; };
> 		CDBFCC451A9FF45300A7B691 /* FullscreenZoomInitialFrame.mm in Sources */ = {isa = PBXBuildFile; fileRef = CDBFCC431A9FF44800A7B691 /* FullscreenZoomInitialFrame.mm */; };
>@@ -2087,6 +2088,7 @@
> 		CDA315961ED53651009F60D3 /* MediaPlaybackSleepAssertion.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = MediaPlaybackSleepAssertion.mm; sourceTree = "<group>"; };
> 		CDA315991ED540A5009F60D3 /* MediaPlaybackSleepAssertion.html */ = {isa = PBXFileReference; lastKnownFileType = text.html; path = MediaPlaybackSleepAssertion.html; sourceTree = "<group>"; };
> 		CDA3159C1ED5643F009F60D3 /* IOKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = IOKit.framework; path = System/Library/Frameworks/IOKit.framework; sourceTree = SDKROOT; };
>+		CDA4438D21F7A47700379489 /* ProcessSuspendMediaBuffering.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = ProcessSuspendMediaBuffering.mm; sourceTree = "<group>"; };
> 		CDB411591E09DA8E00EAD352 /* video-with-muted-audio.html */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.html; path = "video-with-muted-audio.html"; sourceTree = "<group>"; };
> 		CDB5DFFE21360ED800D3E189 /* now-playing.html */ = {isa = PBXFileReference; lastKnownFileType = text.html; path = "now-playing.html"; sourceTree = "<group>"; };
> 		CDBFCC421A9FF44800A7B691 /* FullscreenZoomInitialFrame.html */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.html; path = FullscreenZoomInitialFrame.html; sourceTree = "<group>"; };
>@@ -2542,6 +2544,7 @@
> 				CD227E43211A4D5D00D285AF /* PreferredAudioBufferSize.mm */,
> 				7C1AF7931E8DCBAB002645B9 /* PrepareForMoveToWindow.mm */,
> 				41882F0221010A70002FF288 /* ProcessPreWarming.mm */,
>+				CDA4438D21F7A47700379489 /* ProcessSuspendMediaBuffering.mm */,
> 				518C1152205B04F9001FF4AE /* ProcessSwapOnNavigation.mm */,
> 				5798E2AF1CAF5C2800C5CBA0 /* ProvisionalURLNotChange.mm */,
> 				A1C4FB6C1BACCE50003742D0 /* QuickLook.mm */,
>@@ -4166,6 +4169,7 @@
> 				7CCE7F0C1A411AE600447C4C /* PrivateBrowsingPushStateNoHistoryCallback.cpp in Sources */,
> 				4647B1261EBA3B850041D7EF /* ProcessDidTerminate.cpp in Sources */,
> 				41882F0321010C0D002FF288 /* ProcessPreWarming.mm in Sources */,
>+				CDA4438E21F7A47700379489 /* ProcessSuspendMediaBuffering.mm in Sources */,
> 				518C1153205B0504001FF4AE /* ProcessSwapOnNavigation.mm in Sources */,
> 				7C83E0C11D0A652F00FEBCF3 /* ProvisionalURLNotChange.mm in Sources */,
> 				041A1E34216FFDBC00789E0A /* PublicSuffix.cpp in Sources */,
>diff --git a/Tools/TestWebKitAPI/Tests/WebKitCocoa/ProcessSuspendMediaBuffering.mm b/Tools/TestWebKitAPI/Tests/WebKitCocoa/ProcessSuspendMediaBuffering.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..c584e4f0a05b7b495255d4214cac129fd1bca1b5
>--- /dev/null
>+++ b/Tools/TestWebKitAPI/Tests/WebKitCocoa/ProcessSuspendMediaBuffering.mm
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+
>+#if WK_HAVE_C_SPI
>+
>+#import "PlatformUtilities.h"
>+#import "TestWKWebView.h"
>+
>+#import <WebKit/WKWebViewConfigurationPrivate.h>
>+#import <WebKit/WKWebViewPrivate.h>
>+
>+TEST(WebKit, ProcessSuspendMediaBuffering)
>+{
>+    auto configuration = adoptNS([[WKWebViewConfiguration alloc] init]);
>+    WKRetainPtr<WKContextRef> context(AdoptWK, TestWebKitAPI::Util::createContextForInjectedBundleTest("InternalsInjectedBundleTest"));
>+    configuration.get().processPool = (WKProcessPool *)context.get();
>+    configuration.get()._mediaDataLoadsAutomatically = YES;
>+    configuration.get().mediaTypesRequiringUserActionForPlayback = WKAudiovisualMediaTypeNone;
>+    auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:NSMakeRect(0, 0, 300, 300) configuration:configuration.get() addToWindow:YES]);
>+
>+    __block bool isPlaying = false;
>+    [webView performAfterReceivingMessage:@"playing" action:^() { isPlaying = true; }];
>+
>+    TestWebKitAPI::Util::run(&isPlaying);
>+
>+    auto isElementAllowedToBuffer = [&] {
>+        return [webView stringByEvaluatingJavaScript:@"window.internals.elementShouldBufferData(document.querySelector('video'))"].boolValue;
>+    };
>+
>+    ASSERT_TRUE(isElementAllowedToBuffer());
>+
>+    [webView _processWillSuspendImminentlyForTesting];
>+
>+    ASSERT_FALSE(isElementAllowedToBuffer());
>+
>+    [webView _processDidResumeForTesting];
>+
>+    ASSERT_TRUE(isElementAllowedToBuffer());
>+}
>+
>+#endif // WK_HAVE_C_SPI

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Attachments on bug 193691: 359789 | 360352 | 361418 | 361422 | 363016