[GCM] Adding the OnSendAcknowledgement event

chrome/browser/extensions/extension_gcm_app_handler.cc

 // Copyright 2014 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 "chrome/browser/extensions/extension_gcm_app_handler.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 74 matching lines @@
 }
 
 void ExtensionGCMAppHandler::OnSendError(
     const std::string& app_id,
     const gcm::GCMClient::SendErrorDetails& send_error_details) {
 #if !defined(OS_ANDROID)
   js_event_router_->OnSendError(app_id, send_error_details);
 #endif
 }
 
+void ExtensionGCMAppHandler::OnSendAcknowledged(
+    const std::string& app_id,
+    const std::string& message_id) {
+  // This event is not exposed to JS API. It terminates here.
+}
+
 void ExtensionGCMAppHandler::OnExtensionLoaded(
     content::BrowserContext* browser_context,
     const Extension* extension) {
   if (IsGCMPermissionEnabled(extension))
     AddAppHandler(extension->id());
 }
 
 void ExtensionGCMAppHandler::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const Extension* extension,
@@ skipping 57 matching lines @@
 
 void ExtensionGCMAppHandler::AddAppHandler(const std::string& app_id) {
   GetGCMDriver()->AddAppHandler(app_id, this);
 }
 
 void ExtensionGCMAppHandler::RemoveAppHandler(const std::string& app_id) {
   GetGCMDriver()->RemoveAppHandler(app_id);
 }
 
 }  // namespace extensions