Introduce new test for bookmark loading.

chrome/browser/resources/pdf/pdf.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * @return {number} Width of a scrollbar in pixels
  */
 function getScrollbarWidth() {
@@ skipping 691 matching lines @@
   shouldManageZoom_: function() {
     return !!(chrome.tabs && !this.streamDetails_.embedded &&
               this.streamDetails_.tabId != -1);
   },
 
   /**
    * @type {Viewport} the viewport of the PDF viewer.
    */
   get viewport() {
     return this.viewport_;
+  },
+
+  /**
+   * Each bookmark is an Object containing a:
+   * - title
+   * - page (optional)
+   * - array of children (themselves bookmarks)
+   * @type {Array} the top-level bookmarks of the PDF.
+   */
+  get bookmarks() {
+    return this.bookmarks_;
   }
 };