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 */
@@ skipping 116 matching lines @@
 body:not(.oobe-display) #inner-container {
   height: 262px;
   padding: 0;
   width: 1100px;
 }
 
 body:not(.oobe-display) #progress-dots {
   display: none;
 }
 
+#outer-container.fullscreen,
+#outer-container.fullscreen #oobe,
+#outer-container.fullscreen #oobe #inner-container {
+  height: 100%;
+  width: 100%;
+}
+
 html[build=chrome] #header-sections {
   -webkit-margin-start: -48px;
 }
 
 html[build=chromium] #header-sections {
   -webkit-margin-start: 5px;
 }
 
 .header-section {
   color: rgb(119, 120, 123);  /* Should matching text color of the logo. */
   display: none;
   font-size: 23px;
   line-height: 31px;
   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';
 }