[Sync] Add interface and backend impl for typed URL syncable service

chrome/chrome_tests_unit.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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 862 matching lines @@
         'browser/history/select_favicon_frames_unittest.cc',
         'browser/history/shortcuts_backend_unittest.cc',
         'browser/history/shortcuts_database_unittest.cc',
         'browser/history/snippet_unittest.cc',
         'browser/history/text_database_manager_unittest.cc',
         'browser/history/text_database_unittest.cc',
         'browser/history/thumbnail_database_unittest.cc',
         'browser/history/top_sites_database_unittest.cc',
         'browser/history/top_sites_impl_unittest.cc',
         'browser/history/top_sites_likely_impl_unittest.cc',
+        'browser/history/typed_url_syncable_service_unittest.cc',
         'browser/history/url_database_unittest.cc',
         'browser/history/visit_database_unittest.cc',
         'browser/history/visit_filter_unittest.cc',
         'browser/history/visit_tracker_unittest.cc',
         'browser/importer/firefox_importer_unittest.cc',
         'browser/importer/firefox_importer_unittest_messages_internal.h',
         'browser/importer/firefox_importer_unittest_utils.h',
         'browser/importer/firefox_importer_unittest_utils_mac.cc',
         'browser/importer/firefox_importer_utils_unittest.cc',
         'browser/importer/firefox_profile_lock_unittest.cc',
@@ skipping 1611 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }