Add Machine Provider ui parts

appengine/swarming/elements/res/imp/botpage/bot-page-data.html

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 
   This in an HTML Import-able file that contains the definition
   of the following elements:
 
     <bot-page-data>
 
@@ skipping 37 matching lines @@
 
 <dom-module id="bot-page-data">
   <script>
   (function(){
     // Time to wait before requesting a new bot. This is to allow a user to
     // type in a name and not have it make one set of requests for each
     // keystroke.
     var BOT_ID_DEBOUNCE_MS = 400;
     var lastRequest;
 
-    var BOT_TIMES = ["first_seen_ts", "last_seen_ts"];
+    var BOT_TIMES = ["first_seen_ts", "last_seen_ts", "lease_expiration_ts"];
     var TASK_TIMES = ["started_ts", "completed_ts", "abandoned_ts", "modified_ts"];
 
     var timezone;
     function formatDate(date) {
       if (!timezone) {
         // Date.toString() looks like "Mon Aug 29 2016 09:03:41 GMT-0400 (EDT)"
         // we want to extract the time zone part and append it to the
         // locale time.
         var str = date.toString();
         timezone = str.substring(str.indexOf("("));
@@ skipping 169 matching lines @@
           return b.started_ts - a.started_ts;
         });
 
         return tasks;
       }
 
     });
   })();
   </script>
 </dom-module>