Roll Blink IDLs forward.

html/track/TextTrackCue.idl

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 39 matching lines @@
         setter raises (DOMException);
     attribute long position
         setter raises (DOMException);
     attribute long size
         setter raises (DOMException);
     attribute DOMString align
         setter raises (DOMException);
 
     attribute DOMString text;
     DocumentFragment getCueAsHTML();
-    
+
     attribute EventListener onenter;
     attribute EventListener onexit;
-    
+
     // 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 evt)
         raises(EventException);
+
+#if defined(ENABLE_WEBVTT_REGIONS) && ENABLE_WEBVTT_REGIONS
+    attribute DOMString regionId;
+#endif
 };