components: Introduce AlarmTimer class and use it for GCM heartbeat

components/components_tests.gyp

 # 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.
 
 {
   'variables': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 681 matching lines @@
 
                 # Dependencies of proxmity_auth
                 'components.gyp:proximity_auth',
                 'components.gyp:cryptauth',
                 '../device/bluetooth/bluetooth.gyp:device_bluetooth_mocks',
               ],
             }],
             ['chromeos==1', {
               'sources': [
                 'pairing/message_buffer_unittest.cc',
+                'timers/alarm_timer_unittest.cc',
               ],
               'sources!': [
                 'storage_monitor/storage_monitor_linux_unittest.cc',
               ],
               'dependencies': [
                 'components.gyp:pairing',
                 '../chromeos/chromeos.gyp:chromeos_test_support',
               ],
             }],
             ['OS=="linux"', {
@@ skipping 275 matching lines @@
               'dependencies': [
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }