Add device policy to disallow shutdown - ash UI modifications

chrome/browser/resources/chromeos/login/header_bar.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.
  */
 
 #login-header-bar {
+  -webkit-padding-start: 15px;
   border-bottom: 3px solid black;
   bottom: 0;
   left: 0;
   padding-bottom: 7px;
   position: absolute;
   right: 0;
 }
 
 #login-header-bar {
   /* Using copy of Ash launcher background with 0.8 opacity applied to it.
@@ skipping 12 matching lines @@
 html[screen=lock] .login-header-bar-animate-fast,
 html[screen=oobe] .login-header-bar-animate-fast {
   -webkit-transition: opacity 200ms ease-out;
 }
 
 html[screen=lock] .login-header-bar-animate-slow,
 html[screen=oobe] .login-header-bar-animate-slow {
   -webkit-transition: opacity 2s ease-out;
 }
 
-.header-bar-item:first-child {
-  -webkit-padding-start: 15px;
-}
-
 #login-header-bar button,
 #login-header-bar button:active,
 #login-header-bar button:focus,
 #login-header-bar button:hover {
   background: transparent none;
   box-shadow: none;
   cursor: pointer;
   height: 34px;
   margin: 0;
   min-width: 0;
@@ skipping 13 matching lines @@
 .header-bar-item {
   display: inline-block;
   height: 34px;
 }
 
 html[dir=rtl] .header-bar-item {
   background-position: right center;
 }
 
 #login-header-bar #shutdown-button,
+#login-header-bar #restart-button,
 #login-header-bar #add-user-button,
 #login-header-bar #guest-user-button,
 #login-header-bar #cancel-multiple-sign-in-button {
   -webkit-padding-start: 24px;
   background-position: left center;
   background-repeat: no-repeat;
   background-size: 24px;
 }
 
 html[dir=rtl] #login-header-bar #shutdown-button,
+html[dir=rtl] #login-header-bar #restart-button,
 html[dir=rtl] #login-header-bar #add-user-button,
 html[dir=rtl] #login-header-bar #guest-user-button,
 html[dir=rtl] #login-header-bar #cancel-multiple-sign-in-button {
   background-position: right center;
 }
 
 #login-header-bar #shutdown-button {
   background-image: url(chrome://theme/IDR_ICON_POWER_WHITE);
 }
 
+#login-header-bar #restart-button {
+  background-image: url(chrome://theme/IDR_ICON_POWER_WHITE);
+}
+
 #login-header-bar #add-user-button {
   background-image: url(chrome://theme/IDR_ICON_ADD_USER_WHITE);
 }
 
 #login-header-bar #guest-user-button {
   background-image: url(chrome://theme/IDR_ICON_GUEST_WHITE);
 }
 
 #login-header-bar #cancel-multiple-sign-in-button {
   /* TODO(dzhioev): replace with appropriate image when possible. */
   background-image: url(chrome://theme/IDR_PANEL_CLOSE);
 }
 
 .button-restricted {
   border: 1px solid transparent;
   color: white !important;
   opacity: 0.4 !important;
 }