(2nd try) Add a helper class that keeps per-profile information for FileSystem API

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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' : {
     'pyautolib_sources': [
       'app/chrome_dll_resource.h',
       'common/pref_names.cc',
       'common/pref_names.h',
@@ skipping 1050 matching lines @@
         'browser/extensions/extension_updater_unittest.cc',
         'browser/extensions/extensions_quota_service_unittest.cc',
         'browser/extensions/extensions_service_unittest.cc',
         'browser/extensions/extensions_service_unittest.h',
         'browser/extensions/file_reader_unittest.cc',
         'browser/extensions/image_loading_tracker_unittest.cc',
         'browser/extensions/sandboxed_extension_unpacker_unittest.cc',
         'browser/extensions/user_script_listener_unittest.cc',
         'browser/extensions/user_script_master_unittest.cc',
         'browser/file_path_watcher_unittest.cc',
+        'browser/file_system/file_system_host_context_unittest.cc',
         'browser/find_backend_unittest.cc',
         'browser/first_run/first_run_unittest.cc',
         'browser/geolocation/fake_access_token_store.h',
         'browser/geolocation/gateway_data_provider_common_unittest.cc',
         'browser/geolocation/geolocation_content_settings_map_unittest.cc',
         'browser/geolocation/geolocation_exceptions_table_model_unittest.cc',
         'browser/geolocation/geolocation_permission_context_unittest.cc',
         'browser/geolocation/geolocation_settings_state_unittest.cc',
         'browser/geolocation/gps_location_provider_unittest_linux.cc',
         'browser/geolocation/location_arbitrator_unittest.cc',
@@ skipping 1845 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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