Midway through extracting filters

appengine/swarming/elements/res/imp/botlist/bot-list.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-list>
 
@@ skipping 47 matching lines @@
 
     <url-param name="sort"
       value="{{_sortstr}}"
       default_value="id:asc">
     </url-param>
 
     <swarming-app
       client_id="[[client_id]]"
       auth_headers="{{_auth_headers}}"
       signed_in="{{_signed_in}}"
-
       busy="[[_busy]]"
       name="Swarming Bot List">
 
       <h2 hidden$="[[_signed_in]]">You must sign in to see anything useful.</h2>
 
       <div hidden$="[[_not(_signed_in)]]">
 
         <div class="horizontal layout">
 
           <bot-filters
@@ skipping 216 matching lines @@
         return pool.join(" | ");
       },
       status: function(bot) {
         // If a bot is both dead and quarantined, show the deadness over the
         // quarentinedness.
         if (bot.is_dead) {
           return "Dead.  Last seen " + sk.human.diffDate(bot.last_seen_ts) +
               " ago";
         }
         if (bot.quarantined) {
-          return "Quarantined: " + this._attribute(bot, "quarantined");
+          var msg = this._state(bot, "quarantined")[0];
+          // Sometimes, the quarantined message is actually in "error".  This
+          // happens when the bot code has thrown an exception.
+          if (msg === "unknown" || msg === "true" || msg === true) {
+            msg = this._attribute(bot, "error");
+          }
+          return "Quarantined: " + msg;
         }
         return "Alive";
       },
       task: function(bot){
         return this._taskId(bot);
       },
     };
 
     var deviceColumnMap = {
       android_devices: function(device) {
@@ skipping 29 matching lines @@
       disk_space: function(dir, botA, botB) {
         // We sort based on the raw number of MB of the first disk.
         var botACol = botA.disks[0].mb;
         var botBCol = botB.disks[0].mb;;
         return dir * swarming.naturalCompare(botACol, botBCol);
       },
     };
 
     Polymer({
       is: 'bot-list',
-      behaviors: [SwarmingBehaviors.BotListBehavior,
-                  SwarmingBehaviors.DynamicTableBehavior],
+
+      // The order behaviors are applied in matters - later ones overwrite
+      // attributes of earlier ones
+      behaviors: [
+          SwarmingBehaviors.BotListBehavior,
+          SwarmingBehaviors.DynamicTableBehavior,
+      ],
 
       properties: {
         client_id: {
           type: String,
         },
 
         // For dynamic table.
         _columnMap: {
           type: Object,
           value: columnMap,
@@ skipping 55 matching lines @@
         if (data && data.task_id) {
           return "/user/task/" + data.task_id;
         }
         return undefined;
       }
 
     });
   })();
   </script>
 </dom-module>