Minor improvements of task list

appengine/swarming/elements/res/imp/tasklist/task-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:
 
     <task-list>
 
@@ skipping 102 matching lines @@
               not of much use, so we'll ignore it in _hide() and use this._columns.
               -->
               <th hidden$="[[_hide('state', _columns.*)]]">
                 <span>State</span>
                 <sort-toggle
                     name="state"
                     current="[[_sort]]">
                 </sort-toggle>
               </th>
 
+              <th hidden$="[[_hide('bot', _columns.*)]]">
+                <span>Bot Assigned</span>
+                <sort-toggle
+                    name="bot"
+                    current="[[_sort]]">
+                </sort-toggle>
+              </th>
+
               <th hidden$="[[_hide('deduped_from', _columns.*)]]">
                 <span>Deduped from</span>
                 <sort-toggle
                     name="deduped_from"
                     current="[[_sort]]">
                 </sort-toggle>
               </th>
 
               <template
                     is="dom-repeat"
@@ skipping 28 matching lines @@
                 </td>
                 <td hidden$="[[_hide('state', _columns.*)]]">
                   [[_column('state', task)]]
                   <paper-button
                       raised
                       hidden$="[[_cannotCancel(task,_permissions)]]"
                       on-tap="_promptCancel">
                     Cancel
                   </paper-button>
                 </td>
+                <td hidden$="[[_hide('bot', _columns.*)]]">
+                  <a
+                      class="center"
+                      href$="[[_botLink(task.bot_id)]]"
+                      target="_blank">
+                      [[_column('bot',task)]]
+                  </a>
+                </td>
                 <td hidden$="[[_hide('deduped_from', _columns.*)]]">
                   <a
                       class="center"
                       href$="[[_taskLink(task.deduped_from)]]"
                       target="_blank">
                       [[_column('deduped_from',task)]]
                   </a>
                 </td>
 
                 <template
@@ skipping 20 matching lines @@
         <paper-button dialog-dismiss autofocus>No</paper-button>
         <paper-button dialog-confirm>Yes</paper-button>
       </div>
     </paper-dialog>
 
     <error-toast></error-toast>
 
   </template>
   <script>
   (function(){
-    var specialColumns = ["deduped_from", "name", "state"];
+    var specialColumns = ["deduped_from", "name", "state", "bot"];
 
     // Given a time attribute like "abandoned_ts", humanTime returns a function
     // that returns the human-friendly version of that attribute. The human
     // friendly time was created in task-list-data.
     function humanTime(attr) {
       return function(task) {
         return this._attribute(task, "human_" + attr)[0];
       }
     }
     var columnMap = {
       abandoned_ts: humanTime("abandoned_ts"),
+      bot: function(task) {
+        return this._attribute(task, "bot_id")[0];
+      },
       completed_ts: humanTime("completed_ts"),
       costs_usd: function(task) {
         return this._attribute(task, "costs_usd", 0)[0];
       },
       created_ts: humanTime("created_ts"),
       duration: humanTime("duration"),
       modified_ts: humanTime("modified_ts"),
       started_ts: humanTime("started_ts"),
       state: function(task) {
         var state = this._attribute(task, "state")[0];
@@ skipping 125 matching lines @@
         return task.tagMap[col];
       },
 
       _taskClass: function(task) {
         return this.stateClass(this._column("state", task));
       }
     });
   })();
   </script>
 </dom-module>