text: // 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.
  
  // Helper class for help page, that controls focus transition between
  // elements on the help page and overlays.
  cr.define('help', function() {
    function HelpFocusManager() {
    }
  
    cr.addSingletonGetter(HelpFocusManager);
  
    HelpFocusManager.prototype = {
      __proto__: cr.ui.FocusManager.prototype,
  
      getFocusParent: function() {
        var page = help.HelpPage.getTopmostVisiblePage();
        if (!page)
          return null;
        return page.pageDiv;
      },
    };
  
    return {
      HelpFocusManager: HelpFocusManager,
    };
  });
  