Implement Animation constructor

third_party/WebKit/Source/core/animation/Animation.h

Index: third_party/WebKit/Source/core/animation/Animation.h
diff --git a/third_party/WebKit/Source/core/animation/Animation.h b/third_party/WebKit/Source/core/animation/Animation.h
index d95c92a032f267b10d80f0007e69fbeff5bc4b2f..26360fa18f5fa14b0e512da0048a1f3c35f3122d 100644
--- a/third_party/WebKit/Source/core/animation/Animation.h
+++ b/third_party/WebKit/Source/core/animation/Animation.h
@@ -75,6 +75,16 @@ class CORE_EXPORT Animation final : public EventTargetWithInlineData,
   };
 
   static Animation* Create(AnimationEffectReadOnly*, AnimationTimeline*);
+
+  // Web Animations API IDL constructors.
+  static Animation* Create(ExecutionContext*,
+                           AnimationEffectReadOnly*,
+                           ExceptionState&);
+  static Animation* Create(ExecutionContext*,
+                           AnimationEffectReadOnly*,
+                           AnimationTimeline*,
+                           ExceptionState&);
+
   ~Animation();
   void Dispose();