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

ui/keyboard/keyboard.gyp

 # Copyright (c) 2013 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,
   },
   'targets': [
     {
+      'target_name': 'keyboard_resources',
+      'type': 'none',
+      'variables': {
+        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/ui/keyboard',
+      },
+      'actions': [
+        {
+          'action_name': 'keyboard_resources',
+          'variables': {
+            'grit_grd_file': 'keyboard_resources.grd',
+          },
+          'includes': [ '../../build/grit_action.gypi' ],
+        },
+      ],
+      'includes': [ '../../build/grit_target.gypi' ],
+    },
+    {
       'target_name': 'keyboard',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../skia/skia.gyp:skia',
         '../aura/aura.gyp:aura',
         '../compositor/compositor.gyp:compositor',
         '../ui.gyp:ui',
+        'keyboard_resources',
       ],
       'defines': [
         'KEYBOARD_IMPLEMENTATION',
       ],
       'sources': [
+        'keyboard_constants.cc',
+        'keyboard_constants.h',
         'keyboard_controller.cc',
         'keyboard_controller.h',
         'keyboard_controller_proxy.h',
         'keyboard_export.h',
         'keyboard_switches.cc',
         'keyboard_switches.h',
+        'keyboard_ui_controller.cc',
+        'keyboard_ui_controller.h',
         'keyboard_util.cc',
         'keyboard_util.h',
       ]
     },
     {
       'target_name': 'keyboard_unittests',
       'type': 'executable',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../aura/aura.gyp:aura',
         '../aura/aura.gyp:aura_test_support',
         '../compositor/compositor.gyp:compositor',
         '../ui.gyp:run_ui_unittests',
         '../ui.gyp:ui',
         'keyboard',
       ],
       'sources': [
         'keyboard_controller_unittest.cc',
       ],
     },
   ],
 }