Roll IDLs.

Modules/mediasource/MediaSource.idl

 /*
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 
     attribute double duration setter raises (DOMException);
 
     SourceBuffer addSourceBuffer(in DOMString type) raises (DOMException);
     void removeSourceBuffer(in SourceBuffer buffer) raises (DOMException);
 
     readonly attribute DOMString readyState;
     
     void endOfStream(in [Optional=DefaultIsNullString] DOMString error)
         raises (DOMException);
-    
+
+    static boolean isTypeSupported (DOMString type);
+
     // EventTarget interface
     void addEventListener(in DOMString type,
                           in EventListener listener,
                           in [Optional] boolean useCapture);
     void removeEventListener(in DOMString type,
                              in EventListener listener,
                              in [Optional] boolean useCapture);
     boolean dispatchEvent(in Event event)
         raises(EventException);
 };