Add tests for Google Drive integration in chrome.fileSystem API on Chrome OS.

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.
 {
   'variables' : {
     'chromedriver_unittest_sources': [
       'test/chromedriver/capabilities_unittest.cc',
       'test/chromedriver/chrome/chrome_finder_unittest.cc',
       'test/chromedriver/chrome/console_logger_unittest.cc',
       'test/chromedriver/chrome/device_manager_unittest.cc',
@@ skipping 1104 matching lines @@
         'browser/extensions/api/dns/mock_host_resolver_creator.cc',
         'browser/extensions/api/dns/mock_host_resolver_creator.h',
         'browser/extensions/api/downloads/downloads_api_browsertest.cc',
         'browser/extensions/api/extension_action/browser_action_apitest.cc',
         'browser/extensions/api/extension_action/page_action_apitest.cc',
         'browser/extensions/api/extension_action/page_as_browser_action_apitest.cc',
         'browser/extensions/api/extension_action/script_badge_apitest.cc',
         'browser/extensions/api/feedback_private/feedback_private_apitest.cc',
         'browser/extensions/api/feedback_private/feedback_browsertest.cc',
         'browser/extensions/api/file_system/file_system_apitest.cc',
+        'browser/extensions/api/file_system/file_system_apitest_chromeos.cc',
         'browser/extensions/api/font_settings/font_settings_apitest.cc',
         'browser/extensions/api/gcm/gcm_apitest.cc',
         'browser/extensions/api/history/history_apitest.cc',
         'browser/extensions/api/i18n/i18n_apitest.cc',
         'browser/extensions/api/identity/identity_apitest.cc',
         'browser/extensions/api/idle/idle_apitest.cc',
         'browser/extensions/api/idltest/idltest_apitest.cc',
         'browser/extensions/api/input_ime/input_ime_apitest_chromeos.cc',
         'browser/extensions/api/management/management_api_browsertest.cc',
         'browser/extensions/api/management/management_apitest.cc',
@@ skipping 2022 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }