Web Animations API: Constructing an Animation from a partial keyframe throws a JS exception

Source/core/animation/Animation.h

Index: Source/core/animation/Animation.h
diff --git a/Source/core/animation/Animation.h b/Source/core/animation/Animation.h
index a8f62001d6b7b06cfeffe94e2020c2bfebab3acb..807cbbb26a65e935c034ef985a27c6fa1c4aff0a 100644
--- a/Source/core/animation/Animation.h
+++ b/Source/core/animation/Animation.h
@@ -40,8 +40,9 @@
 
 namespace WebCore {
 
-class Element;
 class Dictionary;
+class Element;
+class ExceptionState;
 
 class Animation FINAL : public TimedItem {
 
@@ -53,9 +54,9 @@ public:
     static PassRefPtr<Animation> create(Element*, PassRefPtrWillBeRawPtr<AnimationEffect>, const Dictionary& timingInputDictionary);
     static PassRefPtr<Animation> create(Element*, PassRefPtrWillBeRawPtr<AnimationEffect>, double duration);
     static PassRefPtr<Animation> create(Element*, PassRefPtrWillBeRawPtr<AnimationEffect>);
-    static PassRefPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector, const Dictionary& timingInputDictionary);
-    static PassRefPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector, double duration);
-    static PassRefPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector);
+    static PassRefPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector, const Dictionary& timingInputDictionary, ExceptionState&);
+    static PassRefPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector, double duration, ExceptionState&);
+    static PassRefPtr<Animation> create(Element*, const Vector<Dictionary>& keyframeDictionaryVector, ExceptionState&);
 
     // FIXME: Move all of these setter methods out of Animation,
     // possibly into a new class (TimingInput?).