MD Bookmarks: Save and close bookmark edit dialog on 'enter' key press.

chrome/test/data/webui/md_bookmarks/edit_dialog_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-edit-dialog>', function() {
   var dialog;
   var lastUpdate;
 
   suiteSetup(function() {
     chrome.bookmarks.update = function(id, edit) {
@@ skipping 37 matching lines @@
     var folder = createFolder('2', [], {title: 'Cool Sites'});
     dialog.showEditDialog(folder);
     dialog.titleValue_ = 'Awesome websites';
 
     MockInteractions.tap(dialog.$.saveButton);
 
     assertEquals(folder.id, lastUpdate.id);
     assertEquals(undefined, lastUpdate.edit.url);
     assertEquals('Awesome websites', lastUpdate.edit.title);
   });
+
+  test('pressing enter saves and closes dialog', function() {
+    var item = createItem('1', {url: 'http://www.example.com'});
+    dialog.showEditDialog(item);
+
+    MockInteractions.pressEnter(dialog.$.url);
+    assertFalse(dialog.$.dialog.open);
+  });
 });