Web Animations: Implement CSS Animation events

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 7f5d7a897f3a0cb2aad36a7c1f8aa2b9cae2a93e..3401708ded92e371e34462b5937894b8e0f063f8 100644
--- a/Source/core/animation/Animation.h
+++ b/Source/core/animation/Animation.h
@@ -42,7 +42,7 @@ class Element;
 class Animation FINAL : public TimedItem {
 
 public:
-    static PassRefPtr<Animation> create(PassRefPtr<Element>, PassRefPtr<AnimationEffect>, const Timing&);
+    static PassRefPtr<Animation> create(PassRefPtr<Element>, PassRefPtr<AnimationEffect>, const Timing&, PassOwnPtr<TimedItemEventDelegate> = nullptr);
 
     const AnimationEffect::CompositableValueMap* compositableValues() const
     {
@@ -57,7 +57,7 @@ protected:
     virtual void willDetach() OVERRIDE FINAL;
 
 private:
-    Animation(PassRefPtr<Element>, PassRefPtr<AnimationEffect>, const Timing&);
+    Animation(PassRefPtr<Element>, PassRefPtr<AnimationEffect>, const Timing&, PassOwnPtr<TimedItemEventDelegate>);
 
     RefPtr<Element> m_target;
     RefPtr<AnimationEffect> m_effect;