Upstream chrome://flags & chrome://ui-alternatives iOS WebUI.

ios/chrome/ios_chrome.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 529 matching lines @@
         'browser/ui/size_class_support_util.mm',
         'browser/ui/ui_util.h',
         'browser/ui/ui_util.mm',
         'browser/ui/uikit_ui_util.h',
         'browser/ui/uikit_ui_util.mm',
         'browser/ui/url_loader.h',
         'browser/ui/webui/about_ui.cc',
         'browser/ui/webui/about_ui.h',
         'browser/ui/webui/crashes_ui.cc',
         'browser/ui/webui/crashes_ui.h',
+        'browser/ui/webui/flags_ui.cc',
+        'browser/ui/webui/flags_ui.h',
         'browser/ui/webui/gcm/gcm_internals_ui.cc',
         'browser/ui/webui/gcm/gcm_internals_ui.h',
         'browser/ui/webui/net_export/net_export_ui.cc',
         'browser/ui/webui/net_export/net_export_ui.h',
         'browser/ui/webui/sync_internals/sync_internals_message_handler.cc',
         'browser/ui/webui/sync_internals/sync_internals_message_handler.h',
         'browser/ui/webui/sync_internals/sync_internals_ui.cc',
         'browser/ui/webui/sync_internals/sync_internals_ui.h',
         'browser/ui/webui/version_handler.cc',
         'browser/ui/webui/version_handler.h',
@@ skipping 190 matching lines @@
             '../../components/components.gyp:omnibox_browser',
             '../../components/components.gyp:rlz',
             '../../components/components.gyp:search_engines',
             '../../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }