[Sheriff-o-matic] Refactor cards and get rid of ct-failure-cards

Tools/GardeningServer/ui/ct-builder-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-builder-failure-card" attributes="group builderList" noscript>
+<polymer-element name="ct-builder-failure-card" attributes="group" noscript>
   <template>
     <style>
+      :host {
+        display: flex;
+        flex: 1;
+      }
+
       ct-builder-grid {
         margin-right: 10px;
         width: 250px;
       }
 
       #failure {
         flex: 1;
       }
     </style>
-    <ct-builder-grid builderList="{{ builderList }}"></ct-builder-grid>
+    <ct-builder-grid builderList="{{ _builderList }}"></ct-builder-grid>
     <div id="failure">
       <template if="{{ group.failure.step == 'building' }}">
         Running
       </template>
       <template if="{{ group.failure.step == 'offline' }}">
         Offline
       </template>
       for {{ group.failure.testName }}
     </div>
   </template>
+  <script>
+    Polymer({
+      group: null,
+      _builderList: null,
+
+      observe: {
+        'group.failure': '_updateBuilderList',
+      },
+
+      _updateBuilderList: function() {
+        this._builderList = new CTBuilderList(this.group.failure);
+      },
+    });
+  </script>
 </polymer-element>