Expose the chromium waterfall in sheriff-o-matic.

Tools/GardeningServer/ui/ct-failure-card.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-builder-grid.html">
 <link rel="import" href="ct-commit-list.html">
 <link rel="import" href="ct-test-list.html">
 
-<polymer-element name="ct-failure-card" attributes="failures commits">
+<polymer-element name="ct-failure-card" attributes="failures commits tree">
   <template>
     <style>
       :host {
         display: flex;
       }
 
       /* FIXME: All this paper-button styling should go in a cr-button component so that
          we can use buttons in different places and have them all look the same. */
       paper-button {
         -webkit-user-select: none;
@@ skipping 28 matching lines @@
       .failure {
         flex: 1;
       }
 
       #examine {
         align-self: flex-start;
       }
     </style>
     <ct-builder-grid failures="{{ failures }}"></ct-builder-grid>
     <div class="failure">
-      <ct-test-list tests="{{ failures }}"></ct-test-list>
+      <ct-test-list tests="{{ failures }}" tree="{{ tree }}"></ct-test-list>
       <ct-commit-list first="{{ failures[0].lastPassingRevisions }}"
           last="{{ failures[0].firstFailingRevisions }}"
           commits="{{ commits }}"></ct-commit-list>
     </div>
     <paper-button id="examine" on-tap="{{ examine }}">Examine</paper-button>
   </template>
   <script>
     Polymer({
       failures: [],
       commits: {},
+      tree: '',
 
       examine: function() {
         this.fire('ct-examine-failures', this.failures);
       },
     });
   </script>
 </polymer-element>