Refactor kiosk app launch to be part of login screen UI flow.

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

 /* 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.
  */
 
 #outer-container {
   -webkit-box-align: center;
   -webkit-box-pack: center;
   -webkit-perspective: 600px;
   bottom: 48px;  /* Leave space for the header bar */
   display: -webkit-box;
   left: 0;
   position: absolute;
   right: 0;
   top: 0;
 }
 
+#outer-container.fullscreen,
+#outer-container.fullscreen #oobe,
+#outer-container.fullscreen #oobe #inner-container {
+  height: 100%;
+  width: 100%;
+}
+
 #inner-container {
   border-radius: 2px;
   padding: 0;
   position: relative;
 }
 
 #inner-container.animation {
   overflow: hidden;
 }
 
@@ skipping 122 matching lines @@
   text-transform: lowercase;
   width: 20em;
 }
 
 .header-section::before {
   /* Divider in header between product name and title,
    * like "[Product name] > [step header]". */
   content: '\00A0\203A\00A0\00A0';
 }