Fix performance regression in WebGL to 2D canvas draws.

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 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 149 matching lines @@
 
     AffineTransform baseTransform() const final;
     void didDraw(const SkIRect& dirtyRect) final;
 
     bool stateHasFilter() final;
     SkImageFilter* stateGetFilter() final;
     void snapshotStateForFilter() final;
 
     void validateStateStack() final;
 
-    PassRefPtr<Image> getImage(SnapshotReason) const final;
+    PassRefPtr<Image> getImage(AccelerationHint, SnapshotReason) const final;
 
     bool isAccelerationOptimalForCanvasContent() const;
 
     void resetUsageTracking();
 
     void incrementFrameCount() { m_usageCounters.numFramesSinceReset++; }
 
     bool isPaintable() const final { return hasImageBuffer(); }
 
 private:
@@ skipping 48 matching lines @@
     bool m_pruneLocalFontCacheScheduled;
     ListHashSet<String> m_fontLRUList;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context,
     context->is2d() && context->canvas(), context.is2d() && context.canvas());
 
 } // namespace blink
 
 #endif // CanvasRenderingContext2D_h