Add UI DevTools under chrome://inspect/#other

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/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 531 matching lines @@
     "//components/startup_metric_utils/browser:lib",
     "//components/strings",
     "//components/subresource_filter/content/browser",
     "//components/suggestions/proto",
     "//components/supervised_user_error_page",
     "//components/sync",
     "//components/sync_preferences",
     "//components/sync_sessions",
     "//components/toolbar",
     "//components/tracing:startup_tracing",
+    "//components/ui_devtools",
     "//components/undo",
     "//components/update_client",
     "//components/upload_list",
     "//components/url_formatter",
     "//components/user_manager",
     "//components/user_prefs",
     "//components/variations",
     "//components/variations/service",
     "//components/version_ui",
     "//components/web_cache/browser",
@@ skipping 2925 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }