Adding an experimental app notification API.

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 867 matching lines @@
         'browser/extensions/apps_promo.cc',
         'browser/extensions/apps_promo.h',
         'browser/extensions/convert_user_script.cc',
         'browser/extensions/convert_user_script.h',
         'browser/extensions/convert_web_app.cc',
         'browser/extensions/convert_web_app.h',
         'browser/extensions/crx_installer.cc',
         'browser/extensions/crx_installer.h',
         'browser/extensions/execute_code_in_tab_function.cc',
         'browser/extensions/execute_code_in_tab_function.h',
+        'browser/extensions/extension_app_api.cc',
+        'browser/extensions/extension_app_api.h',
         'browser/extensions/extension_accessibility_api.cc',
         'browser/extensions/extension_accessibility_api.h',
         'browser/extensions/extension_accessibility_api_constants.cc',
         'browser/extensions/extension_accessibility_api_constants.h',
         'browser/extensions/extension_bookmark_helpers.cc',
         'browser/extensions/extension_bookmark_helpers.h',
         'browser/extensions/extension_bookmark_manager_api.cc',
         'browser/extensions/extension_bookmark_manager_api.h',
         'browser/extensions/extension_bookmarks_module.cc',
         'browser/extensions/extension_bookmarks_module.h',
@@ skipping 3755 matching lines @@
       'hard_dependency': 1,
     },
   ],
 }
 
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