Fix missing finalizeFrame barriers in WebGL animations

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 116 matching lines @@
     RealLostContext,
 
     // Lost context provoked by WEBGL_lose_context.
     WebGLLoseContextLostContext,
 
     // 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() {}
+
   // 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() {}
   virtual void setShouldAntialias(bool) {}
   virtual unsigned hitRegionsCount() const { return 0; }
   virtual void setFont(const String&) {}
   virtual void styleDidChange(const ComputedStyle* oldStyle,
                               const ComputedStyle& newStyle) {}
   virtual HitTestCanvasResult* getControlAndIdIfHitRegionExists(
       const LayoutPoint& location) {
     NOTREACHED();
     return HitTestCanvasResult::create(String(), nullptr);
   }
   virtual String getIdFromControl(const Element* element) { return String(); }
   virtual bool isAccelerationOptimalForCanvasContent() const { return true; }
   virtual void resetUsageTracking(){};
-  virtual void incrementFrameCount(){};
 
   // WebGL-specific interface
   virtual bool is3d() const { return false; }
   virtual void setFilterQuality(SkFilterQuality) { NOTREACHED(); }
   virtual void reshape(int width, int height) { NOTREACHED(); }
   virtual void markLayerComposited() { NOTREACHED(); }
   virtual ImageData* paintRenderingResultsToImageData(SourceDrawingBuffer) {
     NOTREACHED();
     return nullptr;
   }
@@ skipping 34 matching lines @@
   HashSet<String> m_cleanURLs;
   HashSet<String> m_dirtyURLs;
   CanvasColorSpace m_colorSpace;
   CanvasContextCreationAttributes m_creationAttributes;
   bool m_finalizeFrameScheduled = false;
 };
 
 }  // namespace blink
 
 #endif