Add messageerror event handler

third_party/WebKit/Source/modules/broadcastchannel/BroadcastChannel.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BroadcastChannel_h
 #define BroadcastChannel_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
@@ skipping 19 matching lines @@
                                   const String& name,
                                   ExceptionState&);
   ~BroadcastChannel() override;
   void Dispose();
 
   // IDL
   String name() const { return name_; }
   void postMessage(const ScriptValue&, ExceptionState&);
   void close();
   DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
+  DEFINE_ATTRIBUTE_EVENT_LISTENER(messageerror);
 
   // EventTarget:
   const AtomicString& InterfaceName() const override;
   ExecutionContext* GetExecutionContext() const override {
     return ContextLifecycleObserver::GetExecutionContext();
   }
 
   // ScriptWrappable:
   bool HasPendingActivity() const override;
 
@@ skipping 14 matching lines @@
   RefPtr<SecurityOrigin> origin_;
   String name_;
 
   mojo::AssociatedBinding<mojom::blink::BroadcastChannelClient> binding_;
   mojom::blink::BroadcastChannelClientAssociatedPtr remote_client_;
 };
 
 }  // namespace blink
 
 #endif  // BroadcastChannel_h