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

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../../chrome_browser_ui.gypi") ],
@@ skipping 29 matching lines @@
     "//chrome:resources",
     "//chrome:strings",
     "//chrome/app/resources:platform_locale_settings",
     "//chrome/app/theme:theme_resources",
     "//chrome/browser/net:cert_logger_proto",
     "//chrome/common",
     "//chrome/common/net",
     "//components/app_modal",
     "//components/auto_login_parser",
     "//components/dom_distiller/webui",
+    "//components/demo_ui",
     "//components/feedback/proto",
     "//components/history/core/browser:proto",
     "//components/invalidation",
     "//components/onc",
     "//components/password_manager/core/browser",
     "//components/resources",
     "//components/strings",
     "//components/update_client",
     "//content/public/browser",
     "//content/public/common",
@@ skipping 469 matching lines @@
     "//chrome/browser",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/base",
   ]
 }