components: Introduce AlarmTimer class and use it for GCM heartbeat

google_apis/gcm/engine/mcs_client.h

 // 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.
 
 #ifndef GOOGLE_APIS_GCM_ENGINE_MCS_CLIENT_H_
 #define GOOGLE_APIS_GCM_ENGINE_MCS_CLIENT_H_
 
 #include <deque>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/memory/linked_ptr.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "google_apis/gcm/base/gcm_export.h"
 #include "google_apis/gcm/base/mcs_message.h"
 #include "google_apis/gcm/engine/connection_handler.h"
 #include "google_apis/gcm/engine/gcm_store.h"
 #include "google_apis/gcm/engine/heartbeat_manager.h"
 
 namespace base {
 class Clock;
+class Timer;
 }  // namespace base
 
 namespace google {
 namespace protobuf {
 class MessageLite;
 }  // namespace protobuf
 }  // namespace google
 
 namespace mcs_proto {
 class LoginRequest;
@@ skipping 60 matching lines @@
            const std::string& message_id,
            MessageSendStatus status)> OnMessageSentCallback;
 
   MCSClient(const std::string& version_string,
             base::Clock* clock,
             ConnectionFactory* connection_factory,
             GCMStore* gcm_store,
             GCMStatsRecorder* recorder);
   virtual ~MCSClient();
 
+  // Change the timer used for triggering heartbeats.  On Chrome OS, we want to
+  // change the default timer to one that is capable of waking the system from
+  // suspend to ensure that heartbeat messages are sent regularly.
+  void SetHeartbeatTimer(scoped_ptr<base::Timer> timer);

[Nicolas Zea, 2014/10/22 17:32:16]

I think you can pass this in at construction time too.

+
   // Initialize the client. Will load any previous id/token information as well
   // as unacknowledged message information from the GCM storage, if it exists,
   // passing the id/token information back via |initialization_callback| along
   // with a |success == true| result. If no GCM information is present (and
   // this is therefore a fresh client), a clean GCM store will be created and
   // values of 0 will be returned via |initialization_callback| with
   // |success == true|.
   /// If an error loading the GCM store is encountered,
   // |initialization_callback| will be invoked with |success == false|.
   void Initialize(const ErrorCallback& initialization_callback,
@@ skipping 164 matching lines @@
   GCMStatsRecorder* recorder_;
 
   base::WeakPtrFactory<MCSClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MCSClient);
 };
 
 } // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_ENGINE_MCS_CLIENT_H_