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

Source/core/platform/graphics/Image.h

Index: Source/core/platform/graphics/Image.h
diff --git a/Source/core/platform/graphics/Image.h b/Source/core/platform/graphics/Image.h
index ec429809053990555a0eb3727c67f5f5276764d6..aaf7f581948935f9fe08c57d2f698343eccdae2d 100644
--- a/Source/core/platform/graphics/Image.h
+++ b/Source/core/platform/graphics/Image.h
@@ -66,7 +66,7 @@ public:
 
     virtual bool isSVGImage() const { return false; }
     virtual bool isBitmapImage() const { return false; }
-    virtual bool currentFrameKnownToBeOpaque() = 0;
+    virtual bool currentFrameKnownToBeOpaque() { return false; }

[Justin Novosad, 2013/07/22 15:35:41]

No, let's keep this pure virtual.  Implement it in derived class instead.

 
     // Derived classes should override this if they can assure that 
     // the image contains only resources from its own security origin.
@@ -92,8 +92,8 @@ public:
 
     virtual String filenameExtension() const { return String(); } // null string if unknown
 
-    virtual void destroyDecodedData() = 0;
-    virtual unsigned decodedSize() const = 0;
+    virtual void destroyDecodedData() { }

[Justin Novosad, 2013/07/22 15:35:41]

same here

+    virtual unsigned decodedSize() const { return 0; }

[Justin Novosad, 2013/07/22 15:35:41]

and here.

 
     SharedBuffer* data() { return m_encodedImageData.get(); }