Add messageerror event handler

third_party/WebKit/Source/core/workers/DedicatedWorkerGlobalScope.h

 /*
  * Copyright (C) 2009 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 49 matching lines @@
   const AtomicString& InterfaceName() const override;
 
   void postMessage(ScriptState*,
                    PassRefPtr<SerializedScriptValue>,
                    const MessagePortArray&,
                    ExceptionState&);
 
   static bool CanTransferArrayBuffersAndImageBitmaps() { return true; }
 
   DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
+  DEFINE_ATTRIBUTE_EVENT_LISTENER(messageerror);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   friend class DedicatedWorkerThreadForTest;
 
   DedicatedWorkerGlobalScope(const KURL&,
                              const String& user_agent,
                              DedicatedWorkerThread*,
                              double time_origin,
                              std::unique_ptr<SecurityOrigin::PrivilegeData>,
                              WorkerClients*);
 
   InProcessWorkerObjectProxy& WorkerObjectProxy() const;
 };
 
 }  // namespace blink
 
 #endif  // DedicatedWorkerGlobalScope_h