MD Bookmarks: Add 'Open' command, to open in either the BMM or in new tabs

chrome/test/data/webui/md_bookmarks/actions_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.
 
 /**
  * @fileoverview Test suite for action creators that depend on the page state
  * and/or have non-trivial logic.
  */
 
 suite('selectItem', function() {
@@ skipping 23 matching lines @@
       anchor: '2',
     };
     assertDeepEquals(expected, action);
   });
 
   test('can shift-select in regular list', function() {
     store.data.selection.anchor = '2';
     action = bookmarks.actions.selectItem('4', false, true, store.data);
 
     assertDeepEquals(['2', '8', '4'], action.items);
-    assertDeepEquals('4', action.anchor);
+    // Shift-selection doesn't change anchor.
+    assertDeepEquals('2', action.anchor);
   });
 
   test('can shift-select in search results', function() {
     store.data.selectedFolder = null;
     store.data.search = {
       term: 'test',
       results: ['1', '4', '8'],
       inProgress: false,
     };
     store.data.selection.anchor = '8';
@@ skipping 31 matching lines @@
   action = bookmarks.actions.selectFolder('2', nodes);
   assertEquals(null, action);
 
   action = bookmarks.actions.selectFolder('42', nodes);
   assertEquals(null, action);
 
   action = bookmarks.actions.selectFolder('1', nodes);
   assertEquals('select-folder', action.name);
   assertEquals('1', action.id);
 });