Add extension API test 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_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 1983 matching lines @@
         'browser/extensions/extension_bookmark_manager_apitest.cc',
         'browser/extensions/extension_browsertest.cc',
         'browser/extensions/extension_browsertest.h',
         'browser/extensions/extension_browsertests_misc.cc',
         'browser/extensions/extension_clipboard_apitest.cc',
         'browser/extensions/extension_context_menu_apitest.cc',
         'browser/extensions/extension_context_menu_browsertest.cc',
         'browser/extensions/extension_cookies_apitest.cc',
         'browser/extensions/extension_cookies_unittest.cc',
         'browser/extensions/extension_crash_recovery_browsertest.cc',
+        'browser/extensions/extension_fileapi_apitest.cc',
         'browser/extensions/extension_gallery_install_apitest.cc',
         'browser/extensions/extension_geolocation_apitest.cc',
         'browser/extensions/extension_get_views_apitest.cc',
         'browser/extensions/extension_history_apitest.cc',
         'browser/extensions/extension_idle_apitest.cc',
         'browser/extensions/extension_i18n_apitest.cc',
         'browser/extensions/extension_incognito_apitest.cc',
         'browser/extensions/extension_infobar_apitest.cc',
         'browser/extensions/extension_input_apitest.cc',
         'browser/extensions/extension_install_ui_browsertest.cc',
@@ skipping 1397 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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