[MD settings] keep drawer open when toggling advanced page

chrome/browser/resources/settings/settings_ui/settings_ui.js

 // Copyright 2015 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
  * 'settings-ui' implements the UI for the Settings page.
  *
  * Example:
  *
@@ skipping 13 matching lines @@
     directionDelegate: {
       observer: 'directionDelegateChanged_',
       type: Object,
     },
   },
 
   listeners: {
     'sideNav.iron-activate': 'onIronActivate_',
   },
 
-  /** @private */
-  onIronActivate_: function() {
-    this.$$('app-drawer').close();
+  /**
+   * @param {Event} event
+   * @private
+   */
+  onIronActivate_: function(event) {
+    if (event.detail.item != this.$$('app-drawer settings-menu').$.advancedPage)

[michaelpg, 2016/06/22 02:43:00]

what about event.detail.item.id != 'advancedPage'?

[dschuyler, 2016/06/22 23:27:38]

Done.

+      this.$$('app-drawer').close();
   },
 
   /** @private */
   onMenuButtonTap_: function() {
     this.$$('app-drawer').toggle();
   },
 
   /** @private */
   directionDelegateChanged_: function() {
     this.$$('app-drawer').align = this.directionDelegate.isRtl() ?
         'right' : 'left';
   },
 });