sync: beginnings of MessageLoop based SyncerThread

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index a4a36d4907c304c9f4750526c97c22cc0ba43db3..32f64209df8eac8a3643875723f5de9ad9dde88e 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -2700,12 +2700,14 @@
         'browser/sync/engine/clear_data_command_unittest.cc',
         'browser/sync/engine/cleanup_disabled_types_command_unittest.cc',
         'browser/sync/engine/download_updates_command_unittest.cc',
+        'browser/sync/engine/mock_model_safe_workers.cc',
         'browser/sync/engine/mock_model_safe_workers.h',
         'browser/sync/engine/process_commit_response_command_unittest.cc',
         'browser/sync/engine/read_node_mock.h',
         'browser/sync/engine/syncapi_unittest.cc',
         'browser/sync/engine/syncer_proto_util_unittest.cc',
         'browser/sync/engine/syncer_thread_unittest.cc',
+        'browser/sync/engine/syncer_thread2_unittest.cc',
         'browser/sync/engine/syncer_unittest.cc',
         'browser/sync/engine/syncproto_unittest.cc',
         'browser/sync/engine/syncapi_mock.h',
@@ -2719,6 +2721,8 @@
         'browser/sync/sessions/ordered_commit_set_unittest.cc',
         'browser/sync/sessions/status_controller_unittest.cc',
         'browser/sync/sessions/sync_session_unittest.cc',
+        'browser/sync/sessions/test_util.cc',
+        'browser/sync/sessions/test_util.h',
         'browser/sync/syncable/directory_backing_store_unittest.cc',
         'browser/sync/syncable/syncable_id_unittest.cc',
         'browser/sync/syncable/syncable_mock.h',