[Policy Experimental] Add "recommended" policies for URL exceptions.

chrome/browser/resources/options/content_settings.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. */
 
 #content-settings-page {
   min-width: 620px;
 }
 
 #content-settings-exceptions-area {
   min-width: 540px;
@@ skipping 51 matching lines @@
   margin-left: 5px;
 }
 
 div[role='listitem'][controlled-by] {
   color: #666;
   font-style: italic;
   position: relative;
 }
 
 .settings-list div[role='listitem'][controlled-by='policy'],
-.settings-list div[role='listitem'][controlled-by='extension'] {
+.settings-list div[role='listitem'][controlled-by='extension'],
+.settings-list div[role='listitem'][controlled-by='recommended'] {
   background: rgb(250, 230, 146);
   border-bottom: 1px solid rgb(201, 189, 141);
   border-top: 0;
 }
 
 .sublabel {
   -webkit-margin-start: 2em;
 }
 
 select.media-device-control {
@@ skipping 17 matching lines @@
   display: -webkit-box;
 }
 
 #media-audio-column {
   width: 6em;
 }
 
 #media-video-column {
   width: 8.5em;
 }