Fix performance regression in WebGL to 2D canvas draws.

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 63 matching lines @@
 
     static ContextType contextTypeFromId(const String& id);
     static ContextType resolveContextTypeAliases(ContextType);
 
     HTMLCanvasElement* canvas() const { return m_canvas; }
 
     CanvasColorSpace colorSpace() const { return m_colorSpace; };
     WTF::String colorSpaceAsString() const;
     sk_sp<SkColorSpace> skColorSpace() const;
 
-    virtual PassRefPtr<Image> getImage(SnapshotReason) const = 0;
+    virtual PassRefPtr<Image> getImage(AccelerationHint, SnapshotReason) const = 0;
     virtual ContextType getContextType() const = 0;
     virtual bool isAccelerated() const { return false; }
     virtual bool shouldAntialias() const { return false; }
     virtual void setIsHidden(bool) = 0;
     virtual bool isContextLost() const { return true; }
     virtual void setCanvasGetContextResult(RenderingContext&) { NOTREACHED(); };
     virtual void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) { NOTREACHED(); }
     virtual bool isPaintable() const = 0;
 
     // Return true if the content is updated.
@@ skipping 66 matching lines @@
     Member<OffscreenCanvas> m_offscreenCanvas;
     HashSet<String> m_cleanURLs;
     HashSet<String> m_dirtyURLs;
     CanvasColorSpace m_colorSpace;
     CanvasContextCreationAttributes m_creationAttributes;
 };
 
 } // namespace blink
 
 #endif