[extension SW]: Support event listener registration and event dispatching.

extensions/renderer/service_worker_request_sender.cc

 // 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.
 
 #include "extensions/renderer/service_worker_request_sender.h"
 
 #include "base/guid.h"
 #include "content/public/child/worker_thread.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/renderer/worker_thread_dispatcher.h"
@@ skipping 21 matching lines @@
   request_id_to_guid_[params.request_id] = guid;
 
   // Keeps the worker alive during extension function call. Balanced in
   // HandleWorkerResponse().
   dispatcher_->Send(new ExtensionHostMsg_IncrementServiceWorkerActivity(
       service_worker_version_id_, guid));
 
   dispatcher_->Send(new ExtensionHostMsg_RequestWorker(params));
 }
 
+void ServiceWorkerRequestSender::SendIPC(IPC::Message* ipc) {
+  dispatcher_->Send(ipc);
+}
+
 void ServiceWorkerRequestSender::HandleWorkerResponse(
     int request_id,
     int64_t service_worker_version_id,
     bool success,
     const base::ListValue& response,
     const std::string& error) {
   RequestSender::HandleResponse(request_id, success, response, error);
 
   std::map<int, std::string>::iterator iter =
       request_id_to_guid_.find(request_id);
   DCHECK(iter != request_id_to_guid_.end());
   dispatcher_->Send(new ExtensionHostMsg_DecrementServiceWorkerActivity(
       service_worker_version_id_, iter->second));
   request_id_to_guid_.erase(iter);
 }
 
 }  // namespace extensions