Web Animations CSS: Start running animations on the compositor

Source/core/animation/KeyframeAnimationEffect.h

Index: Source/core/animation/KeyframeAnimationEffect.h
diff --git a/Source/core/animation/KeyframeAnimationEffect.h b/Source/core/animation/KeyframeAnimationEffect.h
index d6a44c9369c62fe20ae9e4eccc8f44b0eee096d2..cfe832be3ab3e7c0e3c06862f4430da330676afe 100644
--- a/Source/core/animation/KeyframeAnimationEffect.h
+++ b/Source/core/animation/KeyframeAnimationEffect.h
@@ -81,6 +81,12 @@ public:
         return adoptRef(new KeyframeAnimationEffect(keyframes));
     }
 
+    virtual bool affects(CSSPropertyID property) OVERRIDE
+    {
+        ensureKeyframeGroups();
+        return m_keyframeGroups->contains(property);
+    }
+
     // AnimationEffect implementation.
     virtual PassOwnPtr<CompositableValueMap> sample(int iteration, double fraction) const OVERRIDE;