Notify launcher page with onTransitionChanged event

chrome/chrome_browser_ui.gypi

 # Copyright 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': {
     'chrome_browser_ui_non_ios_sources': [
       'browser/ui/accelerator_utils.h',
       'browser/ui/android/android_about_app_info.cc',
       'browser/ui/android/android_about_app_info.h',
@@ skipping 1131 matching lines @@
       'browser/ui/app_list/app_list_view_delegate.cc',
       'browser/ui/app_list/app_list_view_delegate.h',
       'browser/ui/app_list/extension_app_item.cc',
       'browser/ui/app_list/extension_app_item.h',
       'browser/ui/app_list/extension_app_model_builder.cc',
       'browser/ui/app_list/extension_app_model_builder.h',
       'browser/ui/app_list/extension_uninstaller.cc',
       'browser/ui/app_list/extension_uninstaller.h',
       'browser/ui/app_list/fast_show_pickler.cc',
       'browser/ui/app_list/fast_show_pickler.h',
+      'browser/ui/app_list/launcher_page_event_dispatcher.cc',
+      'browser/ui/app_list/launcher_page_event_dispatcher.h',
       'browser/ui/app_list/model_pref_updater.cc',
       'browser/ui/app_list/model_pref_updater.h',
       'browser/ui/app_list/profile_loader.cc',
       'browser/ui/app_list/profile_loader.h',
       'browser/ui/app_list/profile_store.h',
       'browser/ui/app_list/recommended_apps.cc',
       'browser/ui/app_list/recommended_apps.h',
       'browser/ui/app_list/recommended_apps_observer.h',
       'browser/ui/app_list/search/app_result.cc',
       'browser/ui/app_list/search/app_result.h',
@@ skipping 1319 matching lines @@
       'browser/ui/webui/options/chromeos/display_overscan_handler.h',
       'browser/ui/webui/options/chromeos/power_handler.cc',
       'browser/ui/webui/options/chromeos/power_handler.h',
     ],
     # Used when athena is enabled.
     'chrome_browser_ui_athena_sources': [
       #TODO(mukai): Port AppListService to Athena (crbug.com/417571)
       'browser/ui/app_list/app_list_service_disabled.cc',
 
       'browser/ui/athena/extensions/application_launch_web_app_athena.cc',
-      'browser/ui/athena/extensions/extension_install_ui_factory_athena.cc', 
+      'browser/ui/athena/extensions/extension_install_ui_factory_athena.cc',
       'browser/ui/views/athena/athena_util.cc',
       'browser/ui/views/athena/athena_util.h',
       'browser/ui/views/athena/chrome_browser_main_extra_parts_athena.cc',
       'browser/ui/views/athena/chrome_browser_main_extra_parts_athena.h',
     ],
     # Counts desktop Linux and ChromeOS.
     'chrome_browser_ui_linux_sources': [
       'browser/ui/startup/autolaunch_prompt.cc',
       'browser/ui/views/apps/chrome_apps_client_views.cc',
       'browser/ui/views/frame/taskbar_decorator.cc',
@@ skipping 558 matching lines @@
         ['OS!="android" and OS!="ios"', {
           'dependencies': [
             '../device/bluetooth/bluetooth.gyp:device_bluetooth',
           ],
           'sources': [ '<@(chrome_browser_ui_non_mobile_sources)' ],
         }],
       ],
     },
   ],
 }