color: Add ColorCanvasExtensions runtime flag

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
@@ skipping 180 matching lines @@
   void SnapshotStateForFilter() final;
 
   void ValidateStateStack() const final;
 
   PassRefPtr<Image> GetImage(AccelerationHint, SnapshotReason) const final;
 
   void FinalizeFrame() override { usage_counters_.num_frames_since_reset++; }
 
   bool IsPaintable() const final { return HasImageBuffer(); }
 
-  ColorBehavior DrawImageColorBehavior() const final;
-
   void WillDrawImage(CanvasImageSource*) const final;
 
  protected:
   virtual void NeedsFinalizeFrame() {
     CanvasRenderingContext::NeedsFinalizeFrame();
   }
 
  private:
   friend class CanvasRenderingContext2DAutoRestoreSkCanvas;
 
@@ skipping 60 matching lines @@
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D,
                   CanvasRenderingContext,
                   context,
                   context->Is2d() && context->host(),
                   context.Is2d() && context.host());
 
 }  // namespace blink
 
 #endif  // CanvasRenderingContext2D_h