Add custom filter to bot-list and task-list

appengine/swarming/elements/res/imp/common/common-behavior.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.
 
   It contains the definition of the following Behaviors:
 
     SwarmingBehaviors.CommonBehavior
 
   To use it, include
@@ skipping 90 matching lines @@
 
       _or: function() {
         var result = false;
         // can't use .foreach, as arguments isn't really an Array.
         for (var i = 0; i < arguments.length; i++) {
           result = result || arguments[i];
         }
         return result;
       },
 
-      _taskLink: function(task_id) {
-        if (!task_id) {
+      _taskLink: function(taskId, disableCanonicalID) {
+        if (!taskId) {
           return undefined;
         }
-        return "/newui/task?id=" + task_id;
+        if (!disableCanonicalID) {
+          // task abcefgh0 is the "canonical" task id. The first try has the id
+          // abcefgh1. If there is a second (transparent retry), it will be
+          // abcefgh2.  We almost always want to link to the canonical one,
+          // because the milo output (if any) will only be generated for
+          // abcefgh0, not abcefgh1 or abcefgh2.
+          taskId = taskId.substring(0, taskId.length - 1) + "0";
+        }
+        return "/newui/task?id=" + taskId;
       },
 
       // _timeDiffApprox returns the approximate difference between now and
       // the specified date.
       _timeDiffApprox: function(date){
         if (!date) {
           return "eons";
         }
         return sk.human.diffDate(date.getTime());
       },
 
       // timeDiffExact returns the exact difference between the two specified
       // dates.  E.g. 2d 22h 22m 28s ago If a second date is not provided,
       // now is used.
       _timeDiffExact: function(first, second){
         if (!first) {
           return "eons";
         }
         if (!second) {
           second = new Date();
         }
         return this._humanDuration((second.getTime() - first.getTime())/1000);
       },
     };
   })();
 </script>