Milo: Extract the rietveld information from buildbot.

appengine/cmd/milo/frontend/templates/buildbot/pages/build.html

 {{define "title"}}{{.Build.Summary.Label}}{{end}}
 
 {{define "head"}}{{end}}
 
 {{define "body"}}
   <div class="content">
     <h1>{{.Build.Summary.Label}}</h1>
 
     <div class="column">
 
@@ skipping 33 matching lines @@
       {{ end }}
 
       {{ if .Commit.RequestRevision }}
         <tr><td class="left">Revision</td><td>{{ .Commit.RequestRevision }}</td></tr>
       {{ end }}
 
       {{ if .Commit.Revision }}
         <tr><td class="left">Got Revision</td><td>{{ .Commit.Revision }}</td></tr>
       {{ end }}
 
-      {{ if .Commit.ChangelistURL }}
-        <tr><td class="left">Patch</td><td><a href="{{.Commit.ChangelistURL}}">YES</a></td></tr>
+      {{ if .Commit.Changelist }}
+        <tr><td class="left">Patch</td><td>{{ .Commit.Changelist | linkify }}</td></tr>
       {{ end }}
 
       </table>
       {{ end }}  <!-- with -->
       {{ end }}  <!-- if -->
 
       {{ if or .Build.Summary.Bot .Build.Summary.Source }}
       <h2>Execution:</h2>
       <ul>
         {{ if .Build.Summary.Source }}
@@ skipping 125 matching lines @@
 <script>
 (function() {
   'use strict';
   var startedSpan = document.getElementById('started-time');
   var finishedSpan = document.getElementById('finished-time');
   startedSpan.textContent = milo.formatDate('{{ .Build.Summary.Started }}');
   finishedSpan.textContent = milo.formatDate('{{ .Build.Summary.Finished }}');
 })();
 </script>
 {{end}}