events: Make it a separate component from ui.

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': [
     {
       'target_name': 'message_center',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../skia/skia.gyp:skia',
         '../../url/url.gyp:url_lib',
         '../base/strings/ui_strings.gyp:ui_strings',
+        '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
       ],
       'defines': [
         'MESSAGE_CENTER_IMPLEMENTATION',
       ],
       'sources': [
         'cocoa/notification_controller.h',
         'cocoa/notification_controller.mm',
@@ skipping 106 matching lines @@
         }],
       ],
     },  # 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',
+        '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../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',
+        '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../ui.gyp:run_ui_unittests',
         '../ui.gyp:ui',
         '../../url/url.gyp:url_lib',
         'message_center',
         'message_center_test_support',
       ],
       'sources': [
         'cocoa/notification_controller_unittest.mm',
         'cocoa/popup_collection_unittest.mm',
@@ skipping 37 matching lines @@
         # See http://crbug.com/162998#c4 for why this is needed.
         ['OS=="linux" and linux_use_tcmalloc==1', {
           'dependencies': [
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },  # target_name: message_center_unittests
   ],
 }