Reland: cros: Show notification when low-power charger connected

ui/message_center/message_center.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 107 matching lines @@
             ['exclude', '\\.(cc|mm)$'],
             ['include', '^dummy_message_center\\.cc$'],
             ['include', '^message_center_switches\\.cc$'],
           ],
         }, {  # notifications==1
           'sources!': [ 'dummy_message_center.cc' ],
         }],
       ],
     },  # target_name: message_center
     {
+      'target_name': 'message_center_test_support',
+      'type': 'static_library',
+      'dependencies': [
+        '../../base/base.gyp:base',
+        '../../base/base.gyp:test_support_base',
+        '../../skia/skia.gyp:skia',
+        '../ui.gyp:ui',
+        'message_center',
+      ],
+      'sources': [
+        'fake_message_center.h',
+        'fake_message_center.cc',
+        'fake_notifier_settings_provider.h',
+        'fake_notifier_settings_provider.cc',
+      ],
+    },  # target_name: message_center_test_support
+    {
       'target_name': 'message_center_unittests',
       'type': 'executable',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../ui.gyp:run_ui_unittests',
         '../ui.gyp:ui',
         'message_center',
+        'message_center_test_support',
       ],
       'sources': [
         'cocoa/notification_controller_unittest.mm',
         'cocoa/popup_collection_unittest.mm',
         'cocoa/popup_controller_unittest.mm',
         'cocoa/settings_controller_unittest.mm',
         'cocoa/status_item_view_unittest.mm',
         'cocoa/tray_controller_unittest.mm',
         'cocoa/tray_view_controller_unittest.mm',
         'message_center_tray_unittest.cc',
         'message_center_impl_unittest.cc',
-        'fake_message_center.h',
-        'fake_message_center.cc',
-        'fake_notifier_settings_provider.h',
-        'fake_notifier_settings_provider.cc',
         'notification_list_unittest.cc',
         'test/run_all_unittests.cc',
       ],
       'conditions': [
         ['OS=="mac"', {
           'dependencies': [
             '../ui.gyp:ui_test_support',
           ],
         }],
         ['toolkit_views==1', {
@@ skipping 14 matching lines @@
           'sources/': [
             # Exclude everything except main().
             ['exclude', '\\.(cc|mm)$'],
             ['include', '^test/run_all_unittests\\.cc$'],
           ],
         }],
       ],
     },  # target_name: message_center_unittests
   ],
 }