Expose Web Animations API to Web Workers

Source/core/frame/Window.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 111 matching lines @@
 
     // Self referential attributes
     [Replaceable, DoNotCheckSecurity] readonly attribute Window self;
     [DoNotCheckSecurity, Unforgeable] readonly attribute Window window;
     [Replaceable, DoNotCheckSecurity] readonly attribute  Window frames;
 
     [DoNotCheckSecurity, Custom=Setter] attribute Window opener;
     [Replaceable, DoNotCheckSecurity] readonly attribute Window parent;
     [DoNotCheckSecurity, Unforgeable] readonly attribute Window top;
 
+    [RaisesException, CallWith=ExecutionContext] Worker createAnimationWorker(DOMString url);
+
     // DOM Level 2 AbstractView Interface
     readonly attribute Document document;
 
     // CSSOM View Module
     MediaQueryList matchMedia(DOMString query);
 
     // styleMedia has been removed from the CSSOM View specification.
     readonly attribute StyleMedia styleMedia;
 
     // DOM Level 2 Style Interface
@@ skipping 81 matching lines @@
 // FIXME: make this typedef accurate once enough of http://crbug.com/240176
 // is in place.
 // FIXME: consider putting this typedef in an .idl file containing spec-wide
 // utility type definitions.
 typedef MessagePort Transferable;
 
 Window implements GlobalEventHandlers;
 Window implements WindowBase64;
 Window implements WindowEventHandlers;
 Window implements WindowTimers;