Converted Observatory library-nav-menu element

runtime/observatory/lib/elements.dart

Index: runtime/observatory/lib/elements.dart
diff --git a/runtime/observatory/lib/elements.dart b/runtime/observatory/lib/elements.dart
index 57f9f8627195a2b808719a927fbce1c0e63b5ad4..e68ea6bdef4f48a9acc0aaf5ac64268f9b9af4de 100644
--- a/runtime/observatory/lib/elements.dart
+++ b/runtime/observatory/lib/elements.dart
@@ -61,6 +61,8 @@ export 'package:observatory/src/elements/vm_view.dart';
 
 import 'dart:async';
 
+import 'package:observatory/src/elements/nav/library_menu.dart';
+import 'package:observatory/src/elements/nav/library_menu_wrapper.dart';
 import 'package:observatory/src/elements/nav/menu.dart';
 import 'package:observatory/src/elements/nav/menu_wrapper.dart';
 import 'package:observatory/src/elements/nav/menu_item.dart';
@@ -71,6 +73,7 @@ import 'package:observatory/src/elements/view_footer.dart';
 
 export 'package:observatory/src/elements/helpers/rendering_queue.dart';
 
+export 'package:observatory/src/elements/nav/library_menu.dart';
 export 'package:observatory/src/elements/nav/menu.dart';
 export 'package:observatory/src/elements/nav/menu_item.dart';
 export 'package:observatory/src/elements/nav/refresh.dart';
@@ -79,6 +82,8 @@ export 'package:observatory/src/elements/view_footer.dart';
 // Even though this function does not invoke any asynchronous operation
 // it is marked as async to allow future backward compatible changes.
 Future initElements() async {
+  NavLibraryMenuElement.tag.ensureRegistration();
+  NavLibraryMenuElementWrapper.tag.ensureRegistration();
   NavMenuElement.tag.ensureRegistration();
   NavMenuElementWrapper.tag.ensureRegistration();
   NavMenuItemElement.tag.ensureRegistration();