Add a test for checking that refreshing a page does load the same WebUI page.

chrome/test/data/webui/settings_util.js

+// Copyright (c) 2011 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.
+
+// Utility functions for settings WebUI page.
+function refreshPage() {
+  history.go(0);
+}
+
+function openUnderTheHood() {
+  var item = $('advancedPageNav');
+  assertTrue(item != null);
+  assertTrue(item.onclick != null);
+  item.onclick();
+}