Expose setting API to set ImageAnimationPolicy(Allowed, Once, None)

Source/core/fetch/ImageResourceClient.h

Index: Source/core/fetch/ImageResourceClient.h
diff --git a/Source/core/fetch/ImageResourceClient.h b/Source/core/fetch/ImageResourceClient.h
index b1ce27fdbb4c99ae394b4b97d7d25946702ed0db..dc76bc80c6e4ea77dcc7bae2a5f1e56e20336c2c 100644
--- a/Source/core/fetch/ImageResourceClient.h
+++ b/Source/core/fetch/ImageResourceClient.h
@@ -44,7 +44,7 @@ public:
     // can halt animation. Content nodes that hold image refs for example would not render the image,
     // but RenderImages would (assuming they have visibility: visible and their render tree isn't hidden
     // e.g., in the b/f cache or in a background tab).
-    virtual bool willRenderImage(ImageResource*) { return false; }
+    virtual bool willRenderImage(ImageResource*, bool repeated = false) { return false; }
 };
 
 }