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

chrome/test/data/webui/settings.js

Index: chrome/test/data/webui/settings.js
===================================================================
--- chrome/test/data/webui/settings.js	(revision 82016)
+++ chrome/test/data/webui/settings.js	(working copy)
@@ -9,3 +9,12 @@
   showHomeButton.click();
   showHomeButton.blur();
 }
+
+function testPageIsUnderTheHood() {
+  var pageInstance = AdvancedOptions.getInstance();
+  var topPage = OptionsPage.getTopmostVisiblePage();
+  var expectedTitle = pageInstance.title;
+  var actualTitle = document.title;
+  assertEquals(expectedTitle, actualTitle);
+  assertEquals(pageInstance, topPage);
+}