ServiceWorker: Add initial implementation of ExtendableMessageEvent behind a flag

content/browser/service_worker/service_worker_dispatcher_host.h

 // Copyright 2013 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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 120 matching lines @@
       int embedded_worker_id,
       const EmbeddedWorkerHostMsg_ReportConsoleMessage_Params& params);
   void OnIncrementServiceWorkerRefCount(int handle_id);
   void OnDecrementServiceWorkerRefCount(int handle_id);
   void OnIncrementRegistrationRefCount(int registration_handle_id);
   void OnDecrementRegistrationRefCount(int registration_handle_id);
   void OnPostMessageToWorker(
       int handle_id,
       const base::string16& message,
       const std::vector<TransferredMessagePort>& sent_message_ports);
+
+  // TODO(nhiroki): Remove this after ExtendableMessageEvent is enabled by
+  // default (crbug.com/543198).
+  void OnDeprecatedPostMessageToWorker(
+      int handle_id,
+      const base::string16& message,
+      const std::vector<TransferredMessagePort>& sent_message_ports);
+
   void OnTerminateWorker(int handle_id);
 
   ServiceWorkerRegistrationHandle* FindRegistrationHandle(
       int provider_id,
       int64_t registration_handle_id);
 
   void GetRegistrationObjectInfoAndVersionAttributes(
       base::WeakPtr<ServiceWorkerProviderHost> provider_host,
       ServiceWorkerRegistration* registration,
       ServiceWorkerRegistrationObjectInfo* info,
@@ skipping 75 matching lines @@
 
   bool channel_ready_;  // True after BrowserMessageFilter::sender_ != NULL.
   std::vector<scoped_ptr<IPC::Message>> pending_messages_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_HOST_H_