EME: Add new event handler attributes

third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.idl

 /*
  * Copyright (C) 2013 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 14 matching lines @@
 
 [
     ActiveScriptWrappable,
     DependentLifetime,
 ] interface MediaKeySession : EventTarget {
     // session properties
     readonly attribute DOMString sessionId;
     readonly attribute unrestricted double expiration;
     [CallWith=ScriptState] readonly attribute Promise closed;
     readonly attribute MediaKeyStatusMap keyStatuses;
+    attribute EventHandler onkeystatuseschange;
+    attribute EventHandler onmessage;
 
     // session initialization
     [CallWith=ScriptState] Promise<void> generateRequest(DOMString initDataType, BufferSource initData);
     [CallWith=ScriptState] Promise<boolean> load(DOMString sessionId);
 
     // session operations
     [CallWith=ScriptState] Promise<void> update(BufferSource response);
     [CallWith=ScriptState] Promise<void> close();
     [CallWith=ScriptState] Promise<void> remove();
 };