Disable rendering when suspending on chrome os

chrome/browser/resources/chromeos/login/header_bar.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 Login UI header bar implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 298 matching lines @@
           });
       // Guard timer for 2 seconds + 200 ms + epsilon.
       ensureTransitionEndEvent(launcher, 2250);
 
       this.classList.remove('login-header-bar-animate-slow');
       this.classList.add('login-header-bar-animate-fast');
       this.classList.add('login-header-bar-hidden');
     },
 
     /**
-     * Animates Header bar to slowly appear on the screen.
+     * Animates Header bar to appear on the screen.
      *
+     * @param {boolean} fast Whether the animation should complete quickly or
+     *     slowly.
      * @param {function()} callback will be called once animation is finished.
      */
-    animateIn: function(callback) {
+    animateIn: function(fast, callback) {
       if (callback) {
         var launcher = this;
         launcher.addEventListener(
             'webkitTransitionEnd', function f(e) {
               launcher.removeEventListener('webkitTransitionEnd', f);
               callback();
             });
         // Guard timer for 2 seconds + 200 ms + epsilon.
         ensureTransitionEndEvent(launcher, 2250);
       }
 
-      if (Oobe.getInstance().displayType == DISPLAY_TYPE.OOBE) {
+      if (fast) {
         this.classList.remove('login-header-bar-animate-slow');
         this.classList.add('login-header-bar-animate-fast');
       } else {
         this.classList.remove('login-header-bar-animate-fast');
         this.classList.add('login-header-bar-animate-slow');
       }
 
       this.classList.remove('login-header-bar-hidden');
     },
   };
 
   /**
    * Convenience wrapper of animateOut.
    */
   HeaderBar.animateOut = function(callback) {
     $('login-header-bar').animateOut(callback);
   };
 
   /**
    * Convenience wrapper of animateIn.
    */
-  HeaderBar.animateIn = function(callback) {
-    $('login-header-bar').animateIn(callback);
+  HeaderBar.animateIn = function(fast, callback) {
+    $('login-header-bar').animateIn(fast, callback);
   };
 
   return {
     HeaderBar: HeaderBar
   };
 });