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

ui/keyboard/keyboard.gyp

Index: ui/keyboard/keyboard.gyp
diff --git a/ui/keyboard/keyboard.gyp b/ui/keyboard/keyboard.gyp
index 1a5f9f5d2d38e084e8c8ea34c5f56c84311f4c00..4e4d82b95d27c93fe52d261c8498ef428f4656c4 100644
--- a/ui/keyboard/keyboard.gyp
+++ b/ui/keyboard/keyboard.gyp
@@ -8,6 +8,23 @@
   },
   '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': [
@@ -16,17 +33,22 @@
         '../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',
       ]