[GCM] Adding the OnSendAcknowledgement event

components/gcm_driver/fake_gcm_client.cc

Index: components/gcm_driver/fake_gcm_client.cc
diff --git a/components/gcm_driver/fake_gcm_client.cc b/components/gcm_driver/fake_gcm_client.cc
index 9bad08d9d7950b30c0ffa7811817912367f5cf1b..6a5639c6ae7689a35507e29d042de1b232000363 100644
--- a/components/gcm_driver/fake_gcm_client.cc
+++ b/components/gcm_driver/fake_gcm_client.cc
@@ -203,6 +203,15 @@ void FakeGCMClient::SendFinished(const std::string& app_id,
                    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));
+
   }
 }
 
@@ -224,4 +233,10 @@ void FakeGCMClient::MessageSendError(
     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