[USS] Break NonBlockingDataTypeController into UI specific one and non-UI specific one

components/sync_driver/ui_model_type_controller.cc

Index: components/sync_driver/ui_model_type_controller.cc
diff --git a/components/sync_driver/ui_model_type_controller.cc b/components/sync_driver/ui_model_type_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..63fe9cdc2e57f1c8ec92a2a1838a75682257e1d9
--- /dev/null
+++ b/components/sync_driver/ui_model_type_controller.cc
@@ -0,0 +1,42 @@
+// Copyright 2016 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.
+
+#include "components/sync_driver/ui_model_type_controller.h"
+
+#include "components/sync_driver/sync_client.h"
+#include "sync/api/model_type_service.h"
+#include "sync/internal_api/public/activation_context.h"
+#include "sync/internal_api/public/base/model_type.h"
+
+namespace sync_driver_v2 {
+
+using sync_driver::SyncClient;
+
+UIModelTypeController::UIModelTypeController(
+    const scoped_refptr<base::SingleThreadTaskRunner>& ui_thread,
+    const base::Closure& error_callback,
+    syncer::ModelType model_type,
+    SyncClient* sync_client)
+    : NonBlockingDataTypeController(ui_thread,
+                                    error_callback,
+                                    model_type,
+                                    sync_client) {}
+
+UIModelTypeController::~UIModelTypeController() {}
+
+bool UIModelTypeController::RunOnModelThread(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task) {
+  RunOnUIThread(from_here, task);
+  return true;
+}
+
+void UIModelTypeController::RunOnUIThread(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task) {
+  DCHECK(BelongsToUIThread());
+  task.Run();
+}
+
+}  // namespace sync_driver_v2