Support the crossOrigin IDL attribute over HTMLMediaElement.

Source/core/html/HTMLMediaElement.idl

 /*
  * Copyright (C) 2007, 2010, 2011, 2012 Apple 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 16 matching lines @@
     RuntimeEnabled=Media,
     ActiveDOMObject
 ] interface HTMLMediaElement : HTMLElement {
 
     // error state
     readonly attribute MediaError error;
 
     // network state
     [Reflect, URL, PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] attribute DOMString src;
     [URL, PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] readonly attribute DOMString currentSrc;
+    [Reflect] attribute DOMString crossOrigin;
 
     const unsigned short NETWORK_EMPTY = 0;
     const unsigned short NETWORK_IDLE = 1;
     const unsigned short NETWORK_LOADING = 2;
     const unsigned short NETWORK_NO_SOURCE = 3;
     readonly attribute unsigned short networkState;
     attribute DOMString preload;
 
     readonly attribute TimeRanges buffered;
     void load();
@@ skipping 47 matching lines @@
     [RuntimeEnabled=PrefixedEncryptedMedia, RaisesException] void webkitAddKey([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString keySystem, Uint8Array key, optional Uint8Array initData, [Default=NullString] optional DOMString sessionId);
     [RuntimeEnabled=PrefixedEncryptedMedia, RaisesException] void webkitCancelKeyRequest([TreatNullAs=NullString, TreatUndefinedAs=NullString] DOMString keySystem, [Default=NullString] optional DOMString sessionId);
 
     [RuntimeEnabled=PrefixedEncryptedMedia] attribute EventHandler onwebkitkeyadded;
     [RuntimeEnabled=PrefixedEncryptedMedia] attribute EventHandler onwebkitkeyerror;
     [RuntimeEnabled=PrefixedEncryptedMedia] attribute EventHandler onwebkitkeymessage;
     [RuntimeEnabled=PrefixedEncryptedMedia] attribute EventHandler onwebkitneedkey;
 
     [RuntimeEnabled=EncryptedMedia, Conditional=ENCRYPTED_MEDIA_V2] attribute MediaKeys mediaKeys;
 };