Add multi-process notification class.

chrome/chrome_common.gypi

 # Copyright (c) 2010 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': {
       'chrome_common_target': 0,
     },
     'target_conditions': [
@@ skipping 94 matching lines @@
           'common/message_router.cc',
           'common/message_router.h',
           'common/metrics_helpers.cc',
           'common/metrics_helpers.h',
           'common/mime_registry_messages.cc',
           'common/mime_registry_messages.h',
           'common/multi_process_lock.h',
           'common/multi_process_lock_linux.cc',
           'common/multi_process_lock_mac.cc',
           'common/multi_process_lock_win.cc',
+          'common/multi_process_notification.h',
+          'common/multi_process_notification_linux.cc',
+          'common/multi_process_notification_mac.mm',
+          'common/multi_process_notification_win.cc',
           'common/nacl_cmd_line.cc',
           'common/nacl_cmd_line.h',
           'common/nacl_messages.cc',
           'common/nacl_messages.h',
           'common/nacl_messages_internal.h',
           'common/nacl_types.h',
           'common/notification_details.cc',
           'common/notification_details.h',
           'common/notification_observer.h',
           'common/notification_registrar.cc',
@@ skipping 484 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }