Added UI to enable debugging features on CrOS

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.
 
 {
   'variables': {
     'chrome_browser_ui_non_ios_sources': [
       'browser/ui/accelerator_utils.h',
       'browser/ui/android/android_about_app_info.cc',
       'browser/ui/android/android_about_app_info.h',
@@ skipping 939 matching lines @@
       'browser/ui/webui/chromeos/login/base_screen_handler_utils.cc',
       'browser/ui/webui/chromeos/login/base_screen_handler_utils.h',
       'browser/ui/webui/chromeos/login/controller_pairing_screen_handler.cc',
       'browser/ui/webui/chromeos/login/controller_pairing_screen_handler.h',
       'browser/ui/webui/chromeos/login/core_oobe_handler.cc',
       'browser/ui/webui/chromeos/login/core_oobe_handler.h',
       'browser/ui/webui/chromeos/login/demo_mode_detector.cc',
       'browser/ui/webui/chromeos/login/demo_mode_detector.h',
       'browser/ui/webui/chromeos/login/device_disabled_screen_handler.cc',
       'browser/ui/webui/chromeos/login/device_disabled_screen_handler.h',
+      'browser/ui/webui/chromeos/login/enable_debugging_screen_handler.cc',
+      'browser/ui/webui/chromeos/login/enable_debugging_screen_handler.h',
       'browser/ui/webui/chromeos/login/enrollment_screen_handler.cc',
       'browser/ui/webui/chromeos/login/enrollment_screen_handler.h',
       'browser/ui/webui/chromeos/login/error_screen_handler.cc',
       'browser/ui/webui/chromeos/login/error_screen_handler.h',
       'browser/ui/webui/chromeos/login/eula_screen_handler.cc',
       'browser/ui/webui/chromeos/login/eula_screen_handler.h',
       'browser/ui/webui/chromeos/login/gaia_screen_handler.cc',
       'browser/ui/webui/chromeos/login/gaia_screen_handler.h',
       'browser/ui/webui/chromeos/login/hid_detection_screen_handler.cc',
       'browser/ui/webui/chromeos/login/hid_detection_screen_handler.h',
@@ skipping 2066 matching lines @@
         }],
         ['OS!="android" and OS!="ios"', {
           'dependencies': [
             '../device/bluetooth/bluetooth.gyp:device_bluetooth',
           ],
         }],
       ],
     },
   ],
 }