Drawing an animated image to a canvas now behave as expected

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..ce66cddacec06608a651a20df0a5081ca8e90b8f 100644
--- a/Source/platform/graphics/Image.h
+++ b/Source/platform/graphics/Image.h
@@ -114,6 +114,8 @@ public:
 
     virtual PassRefPtr<NativeImageSkia> nativeImageForCurrentFrame() { return nullptr; }
 
+    virtual PassRefPtr<Image> imageForDefaultFrame();
+
     virtual void drawPattern(GraphicsContext*, const FloatRect&,
         const FloatSize&, const FloatPoint& phase, CompositeOperator,
         const FloatRect&, blink::WebBlendMode = blink::WebBlendModeNormal, const IntSize& repeatSpacing = IntSize());