Keyboard Lock Host implementation

ui/events/keycodes/BUILD.gn

 # Copyright 2016 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.
 
 import("//build/config/ui.gni")
 import("//ui/ozone/ozone.gni")
 
 source_set("xkb") {
   sources = [
     "keyboard_code_conversion_xkb.cc",
@@ skipping 20 matching lines @@
       "keysym_to_unicode.cc",
       "keysym_to_unicode.h",
     ]
 
     defines = [ "KEYCODES_X_IMPLEMENTATION" ]
 
     deps = [
       ":xkb",
       "//base",
       "//ui/events:dom_keycode_converter",
+      "//ui/events:event_constants",
       "//ui/gfx/x",
     ]
 
     configs += [ "//build/config/linux:x11" ]
   }
 }