Make silent task retries more obvious

appengine/swarming/ui/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 484 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);
       },
       first_seen: function(dir, botA, botB) {
         var botACol = botA.first_seen_ts;
         var botBCol = botB.first_seen_ts;
-        return dir * swarming.naturalCompare(botACol, botBCol)
+        return dir * swarming.naturalCompare(botACol, botBCol);
+      },
+      gpu: function(dir, botA, botB) {
+        // We want all the "none" GPU bots to come last in the list.
+        var botACol = this._column("gpu", botA);
+        if (botACol === "none") {
+          botACol = "ZZZ";
+        }
+        var botBCol = this._column("gpu", botB);
+        if (botBCol === "none") {
+          botBCol = "ZZZ";
+        }
+        return dir * swarming.naturalCompare(botACol, botBCol);
       },
       last_seen: function(dir, botA, botB) {
         var botACol = botA.last_seen_ts;
         var botBCol = botB.last_seen_ts;
         return dir * swarming.naturalCompare(botACol, botBCol)
       },
       running_time: function(dir, botA, botB) {
         var botACol = this._state(botA, "running_time") || 0;
         var botBCol = this._state(botB, "running_time") || 0;
         return dir * swarming.naturalCompare(botACol, botBCol)
@@ skipping 122 matching lines @@
           return;
         }
         var url = "/api/swarming/v1/bots/list?" + sk.query.fromParamSet(this._query_params);
         this.$.page_bots.load(url,this._auth_headers);
       }
 
     });
   })();
   </script>
 </dom-module>