High DPI support for themes: Raw images for NTP attribution and background

chrome/browser/resources/ntp4/new_tab.js

 // Copyright (c) 2012 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 New tab page
  * This is the main code for the new tab page used by touch-enabled Chrome
  * browsers.  For now this is still a prototype.
  */
 
@@ skipping 371 matching lines @@
   function setBookmarkBarAttached(attached) {
     document.documentElement.setAttribute('bookmarkbarattached', attached);
   }
 
   /**
    * Attributes the attribution image at the bottom left.
    */
   function updateAttribution() {
     var attribution = $('attribution');
     if (document.documentElement.getAttribute('hasattribution') == 'true') {
-      $('attribution-img').src =
-          'chrome://theme/IDR_THEME_NTP_ATTRIBUTION?' + Date.now();
       attribution.hidden = false;
     } else {
       attribution.hidden = true;
     }
   }
 
   /**
    * Timeout ID.
    * @type {number}
    */
@@ skipping 290 matching lines @@
     setFaviconDominantColor: setFaviconDominantColor,
     showNotification: showNotification,
     themeChanged: themeChanged,
     updateLogin: updateLogin
   };
 });
 
 document.addEventListener('DOMContentLoaded', ntp.onLoad);
 
 var toCssPx = cr.ui.toCssPx;