Make document service an interface

chrome/chrome_tests.gypi

 # Copyright (c) 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1344 matching lines @@
         'browser/chromeos/cros/network_library_unittest.cc',
         'browser/chromeos/cros/network_ui_data_unittest.cc',
         'browser/chromeos/cros/onc_network_parser_unittest.cc',
         'browser/chromeos/cros_settings_unittest.cc',
         'browser/chromeos/customization_document_unittest.cc',
         'browser/chromeos/dbus/cros_dbus_service_unittest.cc',
         'browser/chromeos/dbus/proxy_resolution_service_provider_unittest.cc',
         'browser/chromeos/extensions/file_browser_notifications_unittest.cc',
         'browser/chromeos/external_metrics_unittest.cc',
         'browser/chromeos/gdata/gdata_file_system_unittest.cc',
+        'browser/chromeos/gdata/gdata_mock.cc',
         'browser/chromeos/gdata/gdata_operation_registry_unittest.cc',
         'browser/chromeos/gdata/gdata_parser_unittest.cc',
         'browser/chromeos/gdata/gdata_util_unittest.cc',
         'browser/chromeos/gview_request_interceptor_unittest.cc',
         'browser/chromeos/imageburner/burn_manager_unittest.cc',
         'browser/chromeos/input_method/candidate_window_view_unittest.cc',
         'browser/chromeos/input_method/hotkey_manager_unittest.cc',
         'browser/chromeos/input_method/ibus_controller_unittest.cc',
         'browser/chromeos/input_method/input_method_util_unittest.cc',
         'browser/chromeos/input_method/virtual_keyboard_selector_unittest.cc',
@@ skipping 3322 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }