[cros] Add new stock user images.

chrome/browser/resources/chromeos/login/oobe.css

 /* 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.
  *
  * This is the stylesheet used by the Out of the box experience (OOBE) flow,
  * sign in and lock screens.
  */
 
 html,
 body {
@@ skipping 447 matching lines @@
 }
 
 html[oobe=old] #user-image {
   margin: 0 20px;
 }
 
 #user-image-grid {
   -webkit-user-drag: none;
   -webkit-user-select: none;
   display: inline-block;
+  height: 264px;
   margin: 0;
   outline: none;
   overflow: hidden;
   padding: 0;
   width: 400px;
 }
 
 #user-image-grid img {
   background-color: white;
   height: 50px;
@@ skipping 788 matching lines @@
   width: 100%;
 }
 
 .background-initial {
   opacity: 0;
 }
 
 .background-final {
   opacity: 1;
 }