Add an explicit full-screen button.

remoting/remoting_webapp_files.gypi

 # Copyright 2014 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': {
     'remoting_webapp_info_files': [
       'resources/chromoting16.webp',
       'resources/chromoting48.webp',
       'resources/chromoting128.webp',
@@ skipping 213 matching lines @@
     ],
 
     'remoting_webapp_resource_files': [
       'resources/disclosure_arrow_down.webp',
       'resources/disclosure_arrow_right.webp',
       'resources/drag.webp',
       'resources/host_setup_instructions.webp',
       'resources/icon_close.webp',
       'resources/icon_cross.webp',
       'resources/icon_disconnect.webp',
+      'resources/icon_fullscreen.webp',
       'resources/icon_help.webp',
       'resources/icon_host.webp',
       'resources/icon_maximize_restore.webp',
       'resources/icon_minimize.webp',
       'resources/icon_options.webp',
       'resources/icon_pencil.webp',
       'resources/icon_warning.webp',
       'resources/infographic_my_computers.webp',
       'resources/infographic_remote_assistance.webp',
       'resources/plus.webp',
@@ skipping 48 matching lines @@
       'webapp/html/dialog_token_refresh_failed.html',
       'webapp/html/toolbar.html',
       'webapp/html/ui_header.html',
       'webapp/html/ui_it2me.html',
       'webapp/html/ui_me2me.html',
       'webapp/html/window_frame.html',
     ],
 
   },
 }