Add AnimationTimingProperties dictionary

Source/core/animation/Animation.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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@@ skipping 13 matching lines @@
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  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 // http://dev.w3.org/fxtf/web-animations/#idl-def-Animation
 
 [
-    // FIXME: should be optional union type http://crbug.com/240176
-    Constructor(Element? target, sequence<Dictionary> keyframes),
-    Constructor(Element? target, sequence<Dictionary> keyframes, double timingInput),
-    Constructor(Element? target, sequence<Dictionary> keyframes, Dictionary timingInput),
+    // FIXME: the third argument should be "optional (unrestricted double or AnimationTimingProperties) timing".

[dstockwell, 2015/02/24 03:22:03]

What's still necessary in order to fix this?

[haraken, 2015/02/24 06:11:09]

We don't yet support a dictionary in a union type.

+    Constructor(Element? target, sequence<Dictionary> keyframes, optional unrestricted double timing),
+    Constructor(Element? target, sequence<Dictionary> keyframes, AnimationTimingProperties timing),
     RaisesException=Constructor,
     RuntimeEnabled=WebAnimationsAPI,
 ] interface Animation : AnimationNode {
 };