Set position: absolute on NTP thumbnails

chrome/browser/resources/local_ntp/most_visited_thumbnail.js

 // 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.
 
 
 /**
  * @fileoverview Rendering for iframed most visited thumbnails.
  */
 
 window.addEventListener('DOMContentLoaded', function() {
@@ skipping 12 matching lines @@
       document.body.appendChild(link);
     };
     function createAndAppendThumbnail(isVisible) {
       var image = new Image();
       image.onload = function() {
         var shadow = document.createElement('span');
         shadow.classList.add('shadow');
         var link = createMostVisitedLink(params, data.url, data.title);
         link.appendChild(shadow);
         link.appendChild(image);
+        // We add 'position: absolute' in anticipation that there could be more
+        // than one thumbnail. This will superpose the elements.
+        link.style.position = 'absolute';
         document.body.appendChild(link);
       };
       if (!isVisible) {
         image.style.visibility = 'hidden';
       }
       return image;
     }
 
     if (data.thumbnailUrl) {
       var image = createAndAppendThumbnail(true);
@@ skipping 16 matching lines @@
       } else {
         image.onerror = showDomainElement;
       }
       image.src = data.thumbnailUrl;
       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_THUMBNAIL_ATTEMPT);
     } else {
       showDomainElement();
     }
   });
 });