ntp4: disable animations for pages that are off screen

chrome/browser/resources/ntp4/new_tab.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.
 
 /**
  * @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 308 matching lines @@
 
     // Tell the slider about the pages
     updateSliderCards();
 
     if (highlightApp)
       appAdded(highlightApp);
 
     // Mark the current page
     dots[cardSlider.currentCard].classList.add('selected');
     logEvent('apps.layout: ' + (Date.now() - startTime));
+
+    document.documentElement.classList.remove('starting-up');
   }
 
   /**
    * Called by chrome when a new app has been added to chrome.
    * @param {Object} app A data structure full of relevant information for the
    *     app.
    */
   function appAdded(app) {
     var pageIndex = app.page_index || 0;
     assert(pageIndex == 0, 'pageIndex != 0 not implemented');
@@ skipping 401 matching lines @@
 // TODO(estade): update the content handlers to use ntp namespace instead of
 // making these global.
 var assert = ntp4.assert;
 var getAppsCallback = ntp4.getAppsCallback;
 var appsPrefChangeCallback = ntp4.appsPrefChangeCallback;
 var themeChanged = ntp4.themeChanged;
 var recentlyClosedTabs = ntp4.setRecentlyClosedTabs;
 var setMostVisitedPages = ntp4.setMostVisitedPages;
 
 document.addEventListener('DOMContentLoaded', ntp4.initialize);