V8 Buildbot: Add link to roll status app.

masters/master.client.v8/templates/announce.html

 {% extends "layout.html" %}
 
 {% block header -%}
 {{ super() }}
 <hr/>
 
 <script language="javascript">
   /**
    * A simple HTML iframe string.
    * @param {String} attributes A set of HTML attributes for the table.
@@ skipping 43 matching lines @@
     <tr>
       <td width="50%" style="text-align: right;">
         <b>Sheriff: </b>
         <script src='https://chromium-build.appspot.com/p/chromium/sheriff_v8.js'></script>
         &nbsp;&nbsp;
         <b>Masters: </b>
         <a id="master_v8" href="../client.v8">client.v8</a> |
         <a id="master_v8_branches" href="../client.v8.branches">client.v8.branches</a>
         &nbsp;&nbsp;
         <b>Controls: </b>
-        <a id="tree_status_link" href="https://v8-status.appspot.com">tree status</a>
+        <a id="tree_status_link" href="https://v8-status.appspot.com">tree status</a> |
+        <a id="roll_status_link" href="https://v8-roll.appspot.com">roll status</a>
         &nbsp;&nbsp;
         <b>LKGR: </b>
         <a id="lkgr_link" href="https://v8-status.appspot.com/lkgr">lkgr</a>
         <script language="javascript">
           setTimeout('DisplayLKGR()', 100);
         </script>
         &nbsp;&nbsp;
         <b>Branch builders: </b>
       </td>
       <td width="49%" style="text-align: left;">
@@ skipping 13 matching lines @@
 </center>
 
 </div>
 {% endblock header %}
 
 {% block footer %}
 
 {{ super() }}
 {# <p>Debug info: {{ debuginfo }}</p> #}
 {% endblock %}