components: add wifi_sync component

components/wifi_sync.gypi

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       # GN version: //components/wifi_sync
       'target_name': 'wifi_sync',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
+        '../sync/sync.gyp:sync',
       ],
       'sources': [
+        'wifi_sync/wifi_credential_syncable_service.cc',
+        'wifi_sync/wifi_credential_syncable_service.h',
+        'wifi_sync/wifi_credential_syncable_service_factory.cc',
+        'wifi_sync/wifi_credential_syncable_service_factory.h',
         'wifi_sync/wifi_security_class.h',
       ],
       'conditions': [
         ['chromeos==1', {
           'sources': [
             'wifi_sync/wifi_security_class_chromeos.cc',
           ]
         }],
       ],
     },
   ],
 }