Add non-blocking frame rate limiting logic to display list 2D canvas

Source/platform/graphics/ImageBufferSurface.h

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
     Opaque,
 };
 
 class PLATFORM_EXPORT ImageBufferSurface {
     WTF_MAKE_NONCOPYABLE(ImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
 public:
     virtual ~ImageBufferSurface() { }
 
     virtual SkCanvas* canvas() const = 0;
     virtual const SkBitmap& bitmap();
-    virtual void willUse() { } // Called by ImageBuffer before reading or writing to the surface.
+    virtual void didDraw() { }
     virtual void willReadback() { }
     virtual bool isValid() const = 0;
     virtual bool restore() { return false; };
     virtual blink::WebLayer* layer() const { return 0; };
     virtual bool isAccelerated() const { return false; }
     virtual Platform3DObject getBackingTexture() const { return 0; }
     virtual bool cachedBitmapEnabled() const { return false; }
     virtual const SkBitmap& cachedBitmap() const;
     virtual void invalidateCachedBitmap() { }
     virtual void updateCachedBitmapIfNeeded() { }
@@ skipping 11 matching lines @@
     void clear();
 
 private:
     OpacityMode m_opacityMode;
     IntSize m_size;
 };
 
 } // namespace blink
 
 #endif