[fsp] Add an initial AsyncFileUtil.

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 691 matching lines @@
         'browser/chromeos/file_manager/fake_disk_mount_manager.h',
         'browser/chromeos/file_manager/file_tasks_unittest.cc',
         'browser/chromeos/file_manager/file_watcher_unittest.cc',
         'browser/chromeos/file_manager/mime_util_unittest.cc',
         'browser/chromeos/file_manager/mounted_disk_monitor_unittest.cc',
         'browser/chromeos/file_manager/path_util_unittest.cc',
         'browser/chromeos/file_manager/url_util_unittest.cc',
         'browser/chromeos/file_manager/volume_manager_unittest.cc',
         'browser/chromeos/file_system_provider/fake_provided_file_system.cc',
         'browser/chromeos/file_system_provider/fake_provided_file_system.h',
+        'browser/chromeos/file_system_provider/fileapi/provider_async_file_util_unittest.cc',
         'browser/chromeos/file_system_provider/mount_path_util_unittest.cc',
         'browser/chromeos/file_system_provider/provided_file_system_unittest.cc',
         'browser/chromeos/file_system_provider/request_manager_unittest.cc',
         'browser/chromeos/file_system_provider/service_unittest.cc',
         'browser/chromeos/fileapi/file_access_permissions_unittest.cc',
         'browser/chromeos/fileapi/file_system_backend_unittest.cc',
         'browser/chromeos/imageburner/burn_device_handler_unittest.cc',
         'browser/chromeos/imageburner/burn_manager_unittest.cc',
         'browser/chromeos/input_method/browser_state_monitor_unittest.cc',
         'browser/chromeos/input_method/input_method_configuration_unittest.cc',
@@ skipping 2118 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }