[GCM] Add connection/persistent store metric collection

google_apis/gcm/engine/mcs_client.cc

 // Copyright 2013 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 "google_apis/gcm/engine/mcs_client.h"
 
 #include "base/basictypes.h"
 #include "base/message_loop/message_loop.h"
+#include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time/clock.h"
 #include "base/time/time.h"
 #include "google_apis/gcm/base/mcs_util.h"
 #include "google_apis/gcm/base/socket_stream.h"
 #include "google_apis/gcm/engine/connection_factory.h"
 #include "google_apis/gcm/engine/rmq_store.h"
 
 using namespace google::protobuf::io;
 
@@ skipping 320 matching lines @@
 
   state_ = CONNECTING;
 }
 
 void MCSClient::SendHeartbeat() {
   SendMessage(MCSMessage(kHeartbeatPingTag, mcs_proto::HeartbeatPing()));
 }
 
 void MCSClient::OnRMQUpdateFinished(bool success) {
   LOG_IF(ERROR, !success) << "RMQ Update failed!";
+  UMA_HISTOGRAM_BOOLEAN("GCM.StoreUpdateSucceeded", success);
   // TODO(zea): Rebuild the store from scratch in case of persistence failure?
 }
 
 void MCSClient::MaybeSendMessage() {
   if (to_send_.empty())
     return;
 
   // If the connection has been reset, do nothing. On reconnection
   // MaybeSendMessage will be automatically invoked again.
   // TODO(zea): consider doing TTL expiration at connection reset time, rather
@@ skipping 351 matching lines @@
 
 MCSClient::PersistentId MCSClient::GetNextPersistentId() {
   return base::Uint64ToString(base::TimeTicks::Now().ToInternalValue());
 }
 
 void MCSClient::OnConnectionResetByHeartbeat() {
   connection_factory_->SignalConnectionReset();
 }
 
 } // namespace gcm