[Sync] Start implementation of migration for USS.

components/sync/engine_impl/model_type_worker_unittest.cc

Index: components/sync/engine_impl/model_type_worker_unittest.cc
diff --git a/components/sync/engine_impl/model_type_worker_unittest.cc b/components/sync/engine_impl/model_type_worker_unittest.cc
index dfd8ecf72961dcb088d6cce49625c5d2525bc094..f11f87cb0d9920b92de6734df711b1080fde2d19 100644
--- a/components/sync/engine_impl/model_type_worker_unittest.cc
+++ b/components/sync/engine_impl/model_type_worker_unittest.cc
@@ -192,7 +192,8 @@ class ModelTypeWorkerTest : public ::testing::Test {
 
     // TODO(maxbogue): crbug.com/529498: Inject pending updates somehow.
     worker_ = base::MakeUnique<ModelTypeWorker>(
-        kModelType, state, std::move(cryptographer_copy), &mock_nudge_handler_,
+        kModelType, state, !state.initial_sync_done(),
+        std::move(cryptographer_copy), &mock_nudge_handler_,
         std::move(processor), &preferences_emitter_);
   }