UMA: How often are different network error screens encountered during OOBE

chrome/chrome_tests_unit.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': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 719 matching lines @@
         'browser/chromeos/input_method/input_method_configuration_unittest.cc',
         'browser/chromeos/input_method/input_method_engine_unittest.cc',
         'browser/chromeos/input_method/input_method_manager_impl_unittest.cc',
         'browser/chromeos/input_method/input_method_persistence_unittest.cc',
         'browser/chromeos/input_method/input_method_util_unittest.cc',
         'browser/chromeos/kiosk_mode/kiosk_mode_idle_logout_unittest.cc',
         'browser/chromeos/kiosk_mode/kiosk_mode_settings_unittest.cc',
         'browser/chromeos/locale_change_guard_unittest.cc',
         'browser/chromeos/login/auth/online_attempt_unittest.cc',
         'browser/chromeos/login/auth/parallel_authenticator_unittest.cc',
+        'browser/chromeos/login/error_screens_histogram_helper_unittest.cc',
         'browser/chromeos/login/existing_user_controller_auto_login_unittest.cc',
         'browser/chromeos/login/hwid_checker_unittest.cc',
         'browser/chromeos/login/profile_auth_data_unittest.cc',
         'browser/chromeos/login/saml/saml_offline_signin_limiter_unittest.cc',
         'browser/chromeos/login/screens/screen_context_unittest.cc',
         'browser/chromeos/login/signin/merge_session_load_page_unittest.cc',
         'browser/chromeos/login/supervised/supervised_user_authentication_unittest.cc',
         'browser/chromeos/login/users/multi_profile_user_controller_unittest.cc',
         'browser/chromeos/login/users/user_manager_unittest.cc',
         'browser/chromeos/login/users/wallpaper/wallpaper_manager_unittest.cc',
@@ skipping 2135 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }