Reflect scanning status in command UI. Only allow import once scanning is complete.

ui/file_manager/file_manager/main.html

Index: ui/file_manager/file_manager/main.html
diff --git a/ui/file_manager/file_manager/main.html b/ui/file_manager/file_manager/main.html
index 7bd5d09412cfc79d8a8d8d0dadb6b951f1d76a8e..3f732d4c82d1e72c20fd48c67e2cbf054c0cb807 100644
--- a/ui/file_manager/file_manager/main.html
+++ b/ui/file_manager/file_manager/main.html
@@ -110,6 +110,7 @@
       <script src="foreground/js/file_watcher.js"></script>
       <script src="foreground/js/folder_shortcuts_data_model.js"></script>
       <script src="foreground/js/gear_menu_controller.js"></script>
+      <script src="foreground/js/import_controller.js"></script>
       <script src="foreground/js/launch_param.js"></script>
       <script src="foreground/js/metadata/metadata_cache.js"></script>
       <script src="foreground/js/metadata_update_controller.js"></script>