Add custom filter to bot-list and task-list

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 10 matching lines @@
     None.
 
   Events:
     None.
 -->
 
 <link rel="import" href="/res/imp/bower_components/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="/res/imp/bower_components/polymer/polymer.html">
 
 <link rel="import" href="/res/imp/common/dynamic-table-behavior.html">
+<link rel="import" href="/res/imp/common/error-toast.html">
 <link rel="import" href="/res/imp/common/sort-toggle.html">
 <link rel="import" href="/res/imp/common/swarming-app.html">
 <link rel="import" href="/res/imp/common/url-param.html">
 
 <link rel="import" href="bot-filters.html">
 <link rel="import" href="bot-list-data.html">
 <link rel="import" href="bot-list-shared-behavior.html">
 <link rel="import" href="bot-list-summary.html">
 
 <dom-module id="bot-list">
@@ skipping 159 matching lines @@
                       [[_deviceColumn(c, device, _verbose)]]
                     </td>
                   </template>
                 </tr>
               </template> <!--devices repeat-->
             </template> <!--bot-table repeat-->
           </tbody>
         </table>
       </div>
 
+      <error-toast></error-toast>
     </swarming-app>
 
   </template>
   <script>
   (function(){
     var UNKNOWN = "unknown";
     // see dynamic-table for more information on specialColumns, headerMap,
     // columnMap, and specialSort
     var specialColumns = ["id", "task"];
 
@@ skipping 287 matching lines @@
         if (!device.okay) {
           return "bad-device";
         }
         return "";
       },
 
     });
   })();
   </script>
 </dom-module>