[GCM] Adding the OnSendAcknowledgement event

components/gcm_driver/fake_gcm_client.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_client.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 185 matching lines @@
     send_error_details.message_id = message.id;
     send_error_details.result = NETWORK_ERROR;
     send_error_details.additional_data = message.data;
     base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&FakeGCMClient::MessageSendError,
                    weak_ptr_factory_.GetWeakPtr(),
                    app_id,
                    send_error_details),
         base::TimeDelta::FromMilliseconds(200));
+  } else if(message.id.find("ack") != std::string::npos) {
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&FakeGCMClient::SendAcknowledgement,
+                   weak_ptr_factory_.GetWeakPtr(),
+                   app_id,
+                   message.id),
+        base::TimeDelta::FromMilliseconds(200));
+
   }
 }
 
 void FakeGCMClient::MessageReceived(const std::string& app_id,
                                     const IncomingMessage& message) {
   if (delegate_)
     delegate_->OnMessageReceived(app_id, message);
 }
 
 void FakeGCMClient::MessagesDeleted(const std::string& app_id) {
   if (delegate_)
     delegate_->OnMessagesDeleted(app_id);
 }
 
 void FakeGCMClient::MessageSendError(
     const std::string& app_id,
     const GCMClient::SendErrorDetails& send_error_details) {
   if (delegate_)
     delegate_->OnMessageSendError(app_id, send_error_details);
 }
 
+void FakeGCMClient::SendAcknowledgement(const std::string& app_id,
+                                        const std::string& message_id) {
+  if (delegate_)
+    delegate_->OnSendAcknowledged(app_id, message_id);
+}
+
 }  // namespace gcm