components: Introduce AlarmTimer class and use it for GCM heartbeat

google_apis/gcm/engine/heartbeat_manager_unittest.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 "google_apis/gcm/engine/heartbeat_manager.h"
 
+#include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
+#include "base/timer/timer.h"
 #include "google_apis/gcm/protocol/mcs.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gcm {
 
 namespace {
 
 mcs_proto::HeartbeatConfig BuildHeartbeatConfig(int interval_ms) {
   mcs_proto::HeartbeatConfig config;
   config.set_interval_ms(interval_ms);
   return config;
 }
 
 class TestHeartbeatManager : public HeartbeatManager {
  public:
-  TestHeartbeatManager() {}
+  TestHeartbeatManager()
+      : HeartbeatManager(make_scoped_ptr(
+            new base::Timer(true, /* retain user task */
+                            false /* non repeating */))) {}
   virtual ~TestHeartbeatManager() {}
 
   // Bypass the heartbeat timer, and send the heartbeat now.
   void TriggerHearbeat();
 };
 
 void TestHeartbeatManager::TriggerHearbeat() {
   OnHeartbeatTriggered();
 }
 
@@ skipping 132 matching lines @@
   StartManager();
   EXPECT_GT(manager()->GetNextHeartbeatTime(), base::TimeTicks::Now());
 
   manager()->Stop();
   EXPECT_TRUE(manager()->GetNextHeartbeatTime().is_null());
 }
 
 }  // namespace
 
 }  // namespace gcm