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 706f15ca1331a95c072904b6bd04343637f0aea8..8608f5c3a3dab8b4ed51511804e6f27eb00b1712 100644
--- a/Source/platform/graphics/Image.h
+++ b/Source/platform/graphics/Image.h
@@ -33,6 +33,7 @@
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/ImageOrientation.h"
 #include "platform/graphics/skia/NativeImageSkia.h"
+#include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
@@ -68,6 +69,8 @@ public:
     virtual bool isBitmapImage() const { return false; }
     virtual bool currentFrameKnownToBeOpaque() = 0;
 
+    virtual PassRefPtr<SkImage> image() { return nullptr; }
+
     // 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; }