Make OffscreenCanvas animation in sync with its placeholder canvas's parent frame rate

third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h

Index: third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
diff --git a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
index 6f10cc7993f666a5d33f9ccb9a6ea3e798b8d238..dd44d168cdb7dca55c8e26f4116467b178ed4411 100644
--- a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
+++ b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
@@ -32,6 +32,7 @@ class PLATFORM_EXPORT OffscreenCanvasFrameDispatcherImpl final
 
   // OffscreenCanvasFrameDispatcher implementation.
   ~OffscreenCanvasFrameDispatcherImpl() final;
+  void setNeedsBeginFrame(bool doesNeedBeginFrame);

[Justin Novosad, 2017/01/19 18:06:49]

Missing "final" (I am surprised this compiles)
No need to name the argument (name adds no info).

[xlai (Olivia), 2017/01/19 19:14:34]

Done.

   void dispatchFrame(RefPtr<StaticBitmapImage>,
                      double commitStartTime,
                      bool isWebGLSoftwareRendering = false) final;
@@ -56,15 +57,13 @@ class PLATFORM_EXPORT OffscreenCanvasFrameDispatcherImpl final
  private:
   // Surface-related
   cc::SurfaceIdAllocator m_surfaceIdAllocator;
-  void scheduleSyntheticBeginFrame();  // To be removed (crbug.com/674744)
-
-  TaskHandle m_syntheticBeginFrameTask;  // To be removed (crbug.com/674744)
   const cc::FrameSinkId m_frameSinkId;
   cc::LocalFrameId m_currentLocalFrameId;
 
   int m_width;
   int m_height;
   bool m_changeSizeForNextCommit;
+  bool m_needsBeginFrame;
 
   unsigned m_nextResourceId;
   HashMap<unsigned, RefPtr<StaticBitmapImage>> m_cachedImages;