[sheriff-o-matic]: Basic trooper display for sheriff-o-matic.

Tools/GardeningServer/model/ct-tree-list.html

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <link rel='import' href='ct-tree.html'>
 
 <script>
 function CTTreeList() {
     this.trees = [
         new CTTree('chromium', 'Chromium'),  // First entry is the default.
         new CTTree('blink', 'Blink'),
+        new CTTree('trooper', 'Trooper'),
     ];
 }
 
 CTTreeList.prototype.defaultValue = function() {
     return this.trees[0].name;
 };
 </script>