MD Bookmarks: Lazily render dropdown menus

chrome/test/data/webui/md_bookmarks/toolbar_test.js

 // Copyright 2017 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.
 
 suite('<bookmarks-toolbar>', function() {
   var toolbar;
   var store;
   var commandManager;
 
   suiteSetup(function() {
@@ skipping 70 matching lines @@
     store.data.selection.items = new Set(['2', '3']);
     store.notifyObservers();
     Polymer.dom.flush();
 
     assertTrue(toolbar.showSelectionOverlay);
     assertTrue(
         toolbar.$$('cr-toolbar-selection-overlay').deleteButton.disabled);
   });
 
   test('overflow menu options are disabled when appropriate', function() {
+    MockInteractions.tap(toolbar.$.menuButton);
+    Polymer.dom.flush();
+
     store.data.selectedFolder = '1';
     store.notifyObservers();
 
-    assertFalse(toolbar.$.addBookmarkButton.disabled);
+    assertFalse(toolbar.$$('#addBookmarkButton').disabled);
 
     store.data.selectedFolder = '4';
     store.notifyObservers();
 
-    assertTrue(toolbar.$.addBookmarkButton.disabled);
-    assertFalse(toolbar.$.importBookmarkButton.disabled);
+    assertTrue(toolbar.$$('#addBookmarkButton').disabled);
+    assertFalse(toolbar.$$('#importBookmarkButton').disabled);
 
     store.data.prefs.canEdit = false;
     store.notifyObservers();
 
-    assertTrue(toolbar.$.addBookmarkButton.disabled);
-    assertTrue(toolbar.$.importBookmarkButton.disabled);
+    assertTrue(toolbar.$$('#addBookmarkButton').disabled);
+    assertTrue(toolbar.$$('#importBookmarkButton').disabled);
   });
 });