Add a11y virtual keyboard icon when a11y VK is enabled

ash/ash.gyp

 # Copyright (c) 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': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 433 matching lines @@
         'system/tray_update.cc',
         'system/tray_update.h',
         'system/user/login_status.cc',
         'system/user/login_status.h',
         'system/user/tray_user.cc',
         'system/user/tray_user.h',
         'system/user/tray_user_separator.cc',
         'system/user/tray_user_separator.h',
         'system/user/update_observer.h',
         'system/user/user_observer.h',
+        'system/virtual_keyboard/virtual_keyboard_tray.cc',

[kevers, 2014/03/03 16:58:45]

Might be more appropriate to move to system/chromeos/virtual_keyboard.  We now
have Ash for Windows and this variant of the virtual keyboard is ChromeOS only.

[bshe, 2014/03/03 20:24:03]

Done.

+        'system/virtual_keyboard/virtual_keyboard_tray.h',
         'system/web_notification/web_notification_tray.cc',
         'system/web_notification/web_notification_tray.h',
         'touch/touch_hud_debug.cc',
         'touch/touch_hud_debug.h',
         'touch/touch_hud_projection.cc',
         'touch/touch_hud_projection.h',
         'touch/touch_observer_hud.cc',
         'touch/touch_observer_hud.h',
         'touch/touch_uma.cc',
         'touch/touch_uma.h',
@@ skipping 649 matching lines @@
             },
           },
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }