Expose the chromium waterfall in sheriff-o-matic.

Tools/GardeningServer/ui/ct-unexpected-failures.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="../bower_components/paper-button/paper-button.html">
 <link rel="import" href="../model/ct-commit-log.html">
 <link rel="import" href="ct-failure-analyzer.html">
 <link rel="import" href="ct-failure-stream.html">
 <link rel="import" href="ct-tree-status.html">
 
-<polymer-element name="ct-unexpected-failures">
+<polymer-element name="ct-unexpected-failures" attributes="tree">
   <template>
     <style>
       ct-tree-status {
         white-space: nowrap;
         overflow: hidden;
         text-overflow: ellipsis;
         margin: 5px;
         padding: 3px;
       }
 
       ct-tree-status[status=open] {
         margin: 0;
         padding: 0;
       }
     </style>
     <ct-failure-analyzer id="analyzer" failures="{{ failures }}" builderLatestRevisions="{{ builderLatestRevisions }}"></ct-failure-analyzer>
     <ct-tree-status project="chromium"></ct-tree-status>
     <ct-tree-status project="blink"></ct-tree-status>
-    <ct-failure-stream groups="{{ failures }}" commits="{{ revisionLog }}"></ct-failure-stream>
+    <ct-failure-stream groups="{{ failures[tree] }}" commits="{{ revisionLog }}" tree="{{ tree }}"></ct-failure-stream>
   </template>
   <script>
   (function() {
     var kUpdateFrequency = 1000 * 30;
 
     Polymer({
       revisionLog: new CTCommitLog(),
+      tree: '',
 
       attached: function() {
         this.update();
         setInterval(this.update.bind(this), kUpdateFrequency);
       },
 
       update: function() {
         // FIXME: These shouldn't update if there's already an update in progress.
         this.revisionLog.update();
         this.$.analyzer.update();
         var treeStatuses = this.shadowRoot.querySelectorAll("ct-tree-status");
         for (var i = 0; i < treeStatuses.length; i++)
           treeStatuses[i].update();
       },
     });
   })();
   </script>
 </polymer-element>