[iOS] Add FakeSyncService and factory for testing

ios/ios_tests.gyp

 # 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': {
     'chromium_code': 1,
    },
   'targets': [
     {
       'target_name': 'test_support_ios',
       'type': 'static_library',
       'sources': [
+        # TODO(droger): Move most of these files to
+        # //ios/chrome/ios_chrome_tests.gyp, see http://crbug.com/437333
         'public/test/fake_profile_oauth2_token_service_ios_provider.h',
         'public/test/fake_profile_oauth2_token_service_ios_provider.mm',
         'public/test/fake_string_provider.cc',
         'public/test/fake_string_provider.h',
+        'public/test/fake_sync_service_factory.cc',
+        'public/test/fake_sync_service_factory.h',
         'public/test/test_chrome_browser_provider.h',
         'public/test/test_chrome_browser_provider.mm',
         'public/test/test_chrome_provider_initializer.cc',
         'public/test/test_chrome_provider_initializer.h',
+        'public/test/test_keyed_service_provider.cc',
+        'public/test/test_keyed_service_provider.h',
         'public/test/test_updatable_resource_provider.h',
         'public/test/test_updatable_resource_provider.mm',
       ],
       'dependencies': [
         '../base/base.gyp:base',
+        '../components/components.gyp:keyed_service_core',
+        '../components/components.gyp:keyed_service_ios',
+        '../components/components.gyp:sync_driver_test_support',
         '../testing/gtest.gyp:gtest',
         'provider/ios_provider_chrome.gyp:ios_provider_chrome_browser',
       ],
       'include_dirs': [
         '..',
       ],
     },
   ],
 }