[GCM] Adding the OnSendAcknowledgement event

components/gcm_driver/fake_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 "components/gcm_driver/fake_gcm_app_handler.h"
 
 #include "base/run_loop.h"
 
 namespace gcm {
 
@@ skipping 35 matching lines @@
     const std::string& app_id,
     const GCMClient::SendErrorDetails& send_error_details) {
   ClearResults();
   received_event_ = SEND_ERROR_EVENT;
   app_id_ = app_id;
   send_error_details_ = send_error_details;
   if (run_loop_)
     run_loop_->Quit();
 }
 
+void FakeGCMAppHandler::OnSendAcknowledged(
+    const std::string& app_id,
+    const std::string& message_id) {
+  // TODO(fgorski): Implement when needed in tests.
+}
+
 void FakeGCMAppHandler::ClearResults() {
   received_event_ = NO_EVENT;
   app_id_.clear();
   message_ = GCMClient::IncomingMessage();
   send_error_details_ = GCMClient::SendErrorDetails();
 }
 
 void FakeGCMAppHandler::OnConnected(const net::IPEndPoint& ip_endpoint) {
   connected_ = true;
 }
 
 void FakeGCMAppHandler::OnDisconnected() {
   connected_ = false;
 }
 
 }  // namespace gcm