Add chrome://slow for enabling performance tracing for feedback reports.

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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2037 matching lines @@
         'browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.cc',
         'browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.h',
         'browser/ui/webui/chromeos/mobile_setup_dialog.cc',
         'browser/ui/webui/chromeos/mobile_setup_dialog.h',
         'browser/ui/webui/chromeos/mobile_setup_ui.cc',
         'browser/ui/webui/chromeos/mobile_setup_ui.h',
         'browser/ui/webui/chromeos/proxy_settings_ui.cc',
         'browser/ui/webui/chromeos/proxy_settings_ui.h',
         'browser/ui/webui/chromeos/sim_unlock_ui.cc',
         'browser/ui/webui/chromeos/sim_unlock_ui.h',
+        'browser/ui/webui/chromeos/slow_ui.cc',
+        'browser/ui/webui/chromeos/slow_ui.h',
         'browser/ui/webui/chromeos/system_info_ui.cc',
         'browser/ui/webui/chromeos/system_info_ui.h',
         'browser/ui/webui/chromeos/ui_account_tweaks.cc',
         'browser/ui/webui/chromeos/ui_account_tweaks.h',
         'browser/ui/webui/constrained_web_dialog_ui.cc',
         'browser/ui/webui/constrained_web_dialog_ui.h',
         'browser/ui/webui/constrained_web_dialog_delegate_base.cc',
         'browser/ui/webui/constrained_web_dialog_delegate_base.h',
         'browser/ui/webui/cookies_tree_model_util.cc',
         'browser/ui/webui/cookies_tree_model_util.h',
@@ skipping 1026 matching lines @@
         ['enable_webrtc==0', {
           'sources!': [
             'browser/ui/webui/media/webrtc_logs_ui.cc',
             'browser/ui/webui/media/webrtc_logs_ui.h',
           ],
         }],
       ],
     },
   ],
 }