[SyncFS] Add browser_tests to test authentication state of SyncFS

chrome/chrome_tests.gypi

 # Copyright 2013 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.
 {
   'includes': [
     'js_unittest_vars.gypi',
   ],
   'targets': [
     {
       'target_name': 'interactive_ui_tests',
@@ skipping 1139 matching lines @@
         'browser/extensions/api/reading_list_private/reading_list_private_apitest.cc',
         'browser/extensions/api/screenlock_private/screenlock_private_apitest.cc',
         'browser/extensions/api/sessions/sessions_apitest.cc',
         'browser/extensions/api/settings_overrides/settings_overrides_browsertest.cc',
         'browser/extensions/api/socket/socket_apitest.cc',
         'browser/extensions/api/sockets_tcp/sockets_tcp_apitest.cc',
         'browser/extensions/api/sockets_tcp_server/sockets_tcp_server_apitest.cc',
         'browser/extensions/api/sockets_udp/sockets_udp_apitest.cc',
         'browser/extensions/api/storage/settings_apitest.cc',
         'browser/extensions/api/streams_private/streams_private_apitest.cc',
+        'browser/extensions/api/sync_file_system/sync_file_system_browsertest.cc',
         'browser/extensions/api/sync_file_system/sync_file_system_apitest.cc',
         'browser/extensions/api/system_indicator/system_indicator_apitest.cc',
         'browser/extensions/api/system_cpu/system_cpu_apitest.cc',
         'browser/extensions/api/system_display/system_display_apitest.cc',
         'browser/extensions/api/system_memory/system_memory_apitest.cc',
         'browser/extensions/api/system_network/system_network_apitest.cc',
         'browser/extensions/api/system_private/system_private_apitest.cc',
         'browser/extensions/api/system_storage/storage_api_test_util.cc',
         'browser/extensions/api/system_storage/storage_api_test_util.h',
         'browser/extensions/api/system_storage/system_storage_apitest.cc',
@@ skipping 1872 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }