trooper-o-matic: Add patch attempt timeline view to CQ graphs

appengine/trooper_o_matic/ui/tom-patch-summary-list.css

 /*
 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.
 */
 
 :host {
-  display: {{ model.list.length ? 'block' : 'none' }};
+  display: {{ model._list.length ? 'block' : 'none' }};
 }
 
 :root {
   font-family: RobotoDraft, sans-serif;
 }
 
 .shadow-box {
   margin: 20px;
 }
 
@@ skipping 30 matching lines @@
 
 .item-rows {
   max-height: 80vh;
   overflow-y: scroll;
 }
 
 .row {
   /* Hacky way to accommodate for scrollbar in item rows. */
   margin-right: 16px;
 }