Demo UI made with a help of WUG toolkit (DO NOT SEND TO CQ).

components/components.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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 55 matching lines @@
     'variations.gypi',
     'wallpaper.gypi',
     'web_resource.gypi',
     'webdata.gypi',
   ],
   'conditions': [
     ['OS != "ios"', {
       'includes': [
         'app_modal.gypi',
         'cdm.gypi',
+        'demo_ui.gypi',
         'navigation_interception.gypi',
         'plugins.gypi',
         'power.gypi',
         'visitedlink.gypi',
         'web_cache.gypi',
         'web_contents_delegate_android.gypi',
         'web_modal.gypi',
         'webui_generator.gypi',
       ],
     }],
@@ skipping 62 matching lines @@
         'printing.gypi',
       ],
     }],
     ['enable_plugins==1', {
       'includes': [
         'pdf.gypi',
       ],
     }],
   ],
 }