components: Introduce AlarmTimer class and use it for GCM heartbeat

base/base.gypi

 # Copyright (c) 2012 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
       'base_i18n_target': 0,
     },
@@ skipping 635 matching lines @@
           'time/default_clock.h',
           'time/default_tick_clock.cc',
           'time/default_tick_clock.h',
           'time/tick_clock.cc',
           'time/tick_clock.h',
           'time/time.cc',
           'time/time.h',
           'time/time_mac.cc',
           'time/time_posix.cc',
           'time/time_win.cc',
+          'timer/alarm_timer.cc',
+          'timer/alarm_timer.h',
           'timer/elapsed_timer.cc',
           'timer/elapsed_timer.h',
           'timer/hi_res_timer_manager.h',
           'timer/hi_res_timer_manager_posix.cc',
           'timer/hi_res_timer_manager_win.cc',
           'timer/mock_timer.cc',
           'timer/mock_timer.h',
           'timer/timer.cc',
           'timer/timer.h',
+          'timer/rtc_alarm_chromeos.cc',

[Daniel Erat, 2014/10/15 15:04:21]

nit: fix alphabetization

[Chirantan Ekbote, 2014/10/16 21:26:38]

Done.

+          'timer/rtc_alarm_chromeos.h',
           'tracked_objects.cc',
           'tracked_objects.h',
           'tracking_info.cc',
           'tracking_info.h',
           'tuple.h',
           'values.cc',
           'values.h',
           'value_conversions.cc',
           'value_conversions.h',
           'version.cc',
@@ skipping 329 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }