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..2cdfdec074b99b5ecc95624408afadb04baeaf9e 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 Bindings constructors.

[alancutter (OOO until 2018), 2017/06/07 05:36:15]

I'd like to see the word IDL used here, even just "IDL constructors". "Bindings"
is a bit too generic and overloaded in Chrome.

+  static Animation* Create(ExecutionContext*,
+                           AnimationEffectReadOnly*,
+                           ExceptionState&);
+  static Animation* Create(ExecutionContext*,
+                           AnimationEffectReadOnly*,
+                           AnimationTimeline*,
+                           ExceptionState&);
+
   ~Animation();
   void Dispose();