Synchronize commits at end of JS task

third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h

 /*
  * Copyright (C) 2009 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
@@ skipping 141 matching lines @@
     // Lost context occurred due to internal implementation reasons.
     SyntheticLostContext,
   };
   virtual void loseContext(LostContextMode) {}
 
   // This method gets called at the end of script tasks that modified
   // the contents of the canvas (called didDraw). It marks the completion
   // of a presentable frame.
   virtual void finalizeFrame() {}
 
+  void needsFinalizeFrame();
+
   // WebThread::TaskObserver implementation
   void didProcessTask() override;
   void willProcessTask() final {}
 
   // Canvas2D-specific interface
   virtual bool is2d() const { return false; }
   virtual void restoreCanvasMatrixClipStack(PaintCanvas*) const {}
   virtual void reset() {}
   virtual void clearRect(double x, double y, double width, double height) {}
   virtual void didSetSurfaceSize() {}
@@ skipping 59 matching lines @@
   CanvasColorSpace m_colorSpace;
   CanvasPixelFormat m_pixelFormat;
   bool m_linearPixelMath = false;
   CanvasContextCreationAttributes m_creationAttributes;
   bool m_finalizeFrameScheduled = false;
 };
 
 }  // namespace blink
 
 #endif