Sync: Add a SyncTypePreferenceProvider interface.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 1358 matching lines @@
       'browser/sync/sessions/tab_node_pool.cc',
       'browser/sync/sessions/tab_node_pool.h',
       'browser/sync/startup_controller.cc',
       'browser/sync/startup_controller.h',
       'browser/sync/supervised_user_signin_manager_wrapper.cc',
       'browser/sync/supervised_user_signin_manager_wrapper.h',
       'browser/sync/sync_error_controller.cc',
       'browser/sync/sync_error_controller.h',
       'browser/sync/sync_startup_tracker.cc',
       'browser/sync/sync_startup_tracker.h',
+      'browser/sync/sync_type_preference_provider.h',
       'browser/tab_contents/navigation_metrics_recorder.cc',
       'browser/tab_contents/navigation_metrics_recorder.h',
       'browser/tab_contents/retargeting_details.h',
       'browser/tab_contents/tab_util.cc',
       'browser/tab_contents/tab_util.h',
       'browser/task_profiler/auto_tracking.cc',
       'browser/task_profiler/auto_tracking.h',
       'browser/task_profiler/task_profiler_data_serializer.cc',
       'browser/task_profiler/task_profiler_data_serializer.h',
       'browser/thumbnails/content_analysis.cc',
@@ skipping 2226 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }