[Webapp Refactor] Implement AppRemotingActivity.

remoting/app_remoting_webapp_files.gypi

 # Copyright 2015 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': {
     'ar_shared_resource_files': [
       'webapp/app_remoting/html/ar_dialog.css',
       'webapp/app_remoting/html/ar_main.css',
       'webapp/app_remoting/html/feedback_consent.css',
@@ skipping 30 matching lines @@
       '<(DEPTH)/remoting/webapp/app_remoting/html/template_lg.html',
     'ar_main_template_files': [
       'webapp/base/html/client_plugin.html',
       'webapp/app_remoting/html/context_menu.html',
       'webapp/app_remoting/html/idle_dialog.html',
     ],
     'ar_main_js_files': [
       'webapp/app_remoting/js/application_context_menu.js',
       'webapp/app_remoting/js/app_connected_view.js',
       'webapp/app_remoting/js/app_remoting.js',
+      'webapp/app_remoting/js/app_remoting_activity.js',
       'webapp/app_remoting/js/ar_auth_dialog.js',
       'webapp/app_remoting/js/ar_main.js',
       'webapp/app_remoting/js/context_menu_adapter.js',
       'webapp/app_remoting/js/context_menu_chrome.js',
       'webapp/app_remoting/js/context_menu_dom.js',
       'webapp/app_remoting/js/drag_and_drop.js',
       'webapp/app_remoting/js/idle_detector.js',
       'webapp/app_remoting/js/keyboard_layouts_menu.js',
       'webapp/app_remoting/js/loading_window.js',
       'webapp/app_remoting/js/submenu_manager.js',
@@ skipping 33 matching lines @@
       '<(ar_main_template)',
       '<@(ar_main_template_files)',
       '<(ar_feedback_consent_template)',
       '<(remoting_webapp_template_message_window)',
       '<(remoting_webapp_template_wcs_sandbox)',
       '<@(ar_all_js_files)',
     ],
 
   },  # end of variables
 }