Add a virtual keyboard webui at chrome://keyboard/

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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2221 matching lines @@
         'browser/ui/webui/user_actions/user_actions_ui.cc',
         'browser/ui/webui/user_actions/user_actions_ui.h',
         'browser/ui/webui/user_actions/user_actions_ui_handler.cc',
         'browser/ui/webui/user_actions/user_actions_ui_handler.h',
         'browser/ui/webui/version_handler.cc',
         'browser/ui/webui/version_handler.h',
         'browser/ui/webui/version_handler_chromeos.cc',
         'browser/ui/webui/version_handler_chromeos.h',
         'browser/ui/webui/version_ui.cc',
         'browser/ui/webui/version_ui.h',
+        'browser/ui/webui/virtual_keyboard_ui.cc',
+        'browser/ui/webui/virtual_keyboard_ui.h',
         'browser/ui/webui/welcome_ui_android.cc',
         'browser/ui/webui/welcome_ui_android.h',
         'browser/ui/window_sizer/window_sizer.cc',
         'browser/ui/window_sizer/window_sizer.h',
         'browser/ui/window_sizer/window_sizer_ash.cc',
         'browser/ui/window_sizer/window_sizer_aura.cc',
         'browser/ui/window_sizer/window_sizer_gtk.cc',
         'browser/ui/window_sizer/window_sizer_mac.mm',
         'browser/ui/window_sizer/window_sizer_win.cc',
         'browser/ui/window_snapshot/window_snapshot.cc',
@@ skipping 637 matching lines @@
         }],
         ['enable_message_center==1', {
           'dependencies': [
             '../ui/message_center/message_center.gyp:message_center',
           ],
         }],
       ],
     },
   ],
 }