[Local NTP] Add an integration test for the most visited iframe

chrome/browser/resources/local_ntp/local_ntp.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 The local InstantExtended NTP.
  */
 
 
@@ skipping 322 matching lines @@
 /**
  * Callback for embeddedSearch.newTabPage.onmostvisitedchange. Called when the
  * NTP tiles are updated.
  */
 function onMostVisitedChange() {
   reloadTiles();
 }
 
 
 /**
- * Fetches new data, creates, and renders tiles.
+ * Fetches new data (RIDs) from the embeddedSearch.newTabPage API and passes
+ * them to the iframe.
  */
 function reloadTiles() {
   var pages = ntpApiHandle.mostVisited;
   var cmds = [];
   for (var i = 0; i < Math.min(MAX_NUM_TILES_TO_SHOW, pages.length); ++i) {
     cmds.push({cmd: 'tile', rid: pages[i].rid});
   }
   cmds.push({cmd: 'show', maxVisible: numColumnsShown * NUM_ROWS});
 
   $(IDS.TILES_IFRAME).contentWindow.postMessage(cmds, '*');
@@ skipping 290 matching lines @@
   if (NTP_DESIGN.numTitleLines > 1)
     args.push('ntl=' + NTP_DESIGN.numTitleLines);
 
   args.push('removeTooltip=' +
       encodeURIComponent(configData.translatedStrings.removeThumbnailTooltip));
 
   // Create the most visited iframe.
   var iframe = document.createElement('iframe');
   iframe.id = IDS.TILES_IFRAME;
   iframe.tabIndex = 1;
-  iframe.src = '//most-visited/single.html?' + args.join('&');
+  iframe.src = 'chrome-search://most-visited/single.html?' + args.join('&');
   $(IDS.TILES).appendChild(iframe);
 
   iframe.onload = function() {
     reloadTiles();
     renderTheme();
   };
 
   window.addEventListener('message', handlePostMessage);
 }
 
 
 /**
  * Binds event listeners.
  */
 function listen() {
   document.addEventListener('DOMContentLoaded', init);
 }
 
 return {
   init: init,  // Exposed for testing.
   listen: listen
 };
 
 }
 
 if (!window.localNTPUnitTest) {
   LocalNTP().listen();
 }