Expose the chromium waterfall in sheriff-o-matic.

Tools/GardeningServer/ui/ct-failure-card.html

Index: Tools/GardeningServer/ui/ct-failure-card.html
diff --git a/Tools/GardeningServer/ui/ct-failure-card.html b/Tools/GardeningServer/ui/ct-failure-card.html
index 9d3cb24ca53c39ba539d2562f9efce589d60847e..98af69e4807625a30832d62bb76031a5fae0136e 100644
--- a/Tools/GardeningServer/ui/ct-failure-card.html
+++ b/Tools/GardeningServer/ui/ct-failure-card.html
@@ -8,7 +8,7 @@ found in the LICENSE file.
 <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 {
@@ -57,7 +57,7 @@ found in the LICENSE file.
     </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>
@@ -68,6 +68,7 @@ found in the LICENSE file.
     Polymer({
       failures: [],
       commits: {},
+      tree: '',
 
       examine: function() {
         this.fire('ct-examine-failures', this.failures);