[GCM] Adding the OnSendAcknowledgement event

components/gcm_driver/gcm_driver_desktop.h

 // 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.
 
 #ifndef COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 90 matching lines @@
   void DoSend(const std::string& app_id,
               const std::string& receiver_id,
               const GCMClient::OutgoingMessage& message);
 
   // Callbacks posted from IO thread to UI thread.
   void MessageReceived(const std::string& app_id,
                        const GCMClient::IncomingMessage& message);
   void MessagesDeleted(const std::string& app_id);
   void MessageSendError(const std::string& app_id,
                         const GCMClient::SendErrorDetails& send_error_details);
+  void SendAcknowledged(const std::string& app_id,
+                        const std::string& message_id);
   void GCMClientReady();
   void OnConnected(const net::IPEndPoint& ip_endpoint);
   void OnDisconnected();
 
   void GetGCMStatisticsFinished(const GCMClient::GCMStatistics& stats);
 
   // Flag to indicate whether the user is signed in to a GAIA account.
   // TODO(jianli): To be removed when sign-in enforcement is dropped.
   bool signed_in_;
 
@@ skipping 22 matching lines @@
 
   // Used to pass a weak pointer to the IO worker.
   base::WeakPtrFactory<GCMDriverDesktop> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriverDesktop);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_DESKTOP_H_