Use SkImage as a backing store for copying 2d Contexts to ImageBitmaps.

Source/core/platform/graphics/GraphicsContext.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 27 matching lines @@
 #include "core/platform/graphics/ImageBuffer.h"
 #include "core/platform/graphics/ImageOrientation.h"
 #include "core/platform/graphics/skia/OpaqueRegionSkia.h"
 #include "wtf/FastAllocBase.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
 
 class SkBitmap;
 class SkDevice;
+class SkImage;
 class SkPaint;
 class SkPath;
 class SkRRect;
 struct SkRect;
 
 namespace WebCore {
 
 class ImageBuffer;
 class KURL;
 
@@ skipping 174 matching lines @@
     void clearRect(const FloatRect&);
 
     void strokeRect(const FloatRect&, float lineWidth);
 
     void drawImage(Image*, const IntPoint&, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation);
     void drawImage(Image*, const IntRect&, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation, bool useLowQualityScale = false);
     void drawImage(Image*, const IntPoint& destPoint, const IntRect& srcRect, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation);
     void drawImage(Image*, const FloatRect& destRect);
     void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation, bool useLowQualityScale = false);
     void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator, BlendMode, RespectImageOrientationEnum = DoNotRespectImageOrientation, bool useLowQualityScale = false);
+    void drawImage(SkImage*, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator = CompositeSourceOver, BlendMode = BlendModeNormal, bool useLowQualityScale = false);
 
     void drawTiledImage(Image*, const IntRect& destRect, const IntPoint& srcPoint, const IntSize& tileSize,
         CompositeOperator = CompositeSourceOver, bool useLowQualityScale = false, BlendMode = BlendModeNormal);
     void drawTiledImage(Image*, const IntRect& destRect, const IntRect& srcRect,
         const FloatSize& tileScaleFactor, Image::TileRule hRule = Image::StretchTile, Image::TileRule vRule = Image::StretchTile,
         CompositeOperator = CompositeSourceOver, bool useLowQualityScale = false);
 
     void drawImageBuffer(ImageBuffer*, const IntPoint&, CompositeOperator = CompositeSourceOver, BlendMode = BlendModeNormal);
     void drawImageBuffer(ImageBuffer*, const IntRect&, CompositeOperator = CompositeSourceOver, BlendMode = BlendModeNormal, bool useLowQualityScale = false);
     void drawImageBuffer(ImageBuffer*, const IntPoint& destPoint, const IntRect& srcRect, CompositeOperator = CompositeSourceOver, BlendMode = BlendModeNormal);
@@ skipping 212 matching lines @@
     // FIXME: Make this go away: crbug.com/236892
     bool m_updatingControlTints : 1;
     bool m_accelerated : 1;
     bool m_isCertainlyOpaque : 1;
     bool m_printing : 1;
 };
 
 } // namespace WebCore
 
 #endif // GraphicsContext_h