Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/Image.h

Index: Source/platform/graphics/Image.h
diff --git a/Source/platform/graphics/Image.h b/Source/platform/graphics/Image.h
index 825ff21245c395389b829253b3fee0a81f9978ab..8b40396bd8cf139bffc80e43e53e2471367d7625 100644
--- a/Source/platform/graphics/Image.h
+++ b/Source/platform/graphics/Image.h
@@ -41,6 +41,8 @@
 #include "wtf/RetainPtr.h"
 #include "wtf/text/WTFString.h"
 
+class SkImage;
+
 namespace blink {
 
 class FloatPoint;
@@ -69,6 +71,8 @@ public:
     virtual bool isBitmapImage() const { return false; }
     virtual bool currentFrameKnownToBeOpaque() = 0;
 
+    virtual PassRefPtr<SkImage> skImage();
+
     // Derived classes should override this if they can assure that the current
     // image frame contains only resources from its own security origin.
     virtual bool currentFrameHasSingleSecurityOrigin() const { return false; }