[milo] add milo version to page base

milo/frontend/expectations/swarming.build-build-running.html

Index: milo/frontend/expectations/swarming.build-build-running.html
diff --git a/milo/frontend/expectations/swarming.build-build-running.html b/milo/frontend/expectations/swarming.build-build-running.html
index 2df7490043a7ddbfc72fa5c229474b872bf5f4f0..b1d1e9c5223ad5fddf2d09a98387e1974d941db9 100644
--- a/milo/frontend/expectations/swarming.build-build-running.html
+++ b/milo/frontend/expectations/swarming.build-build-running.html
@@ -270,7 +270,8 @@ $(document).ready(function() {
     <hr>
     <a href="https://github.com/luci">luci</a>,
     working for the <a href="https://chromium.org/">Chromium</a> project.<br>
-    Page built: <b><span class="local-time" data-timestamp="-6792498672871">Saturday, 03-Feb-01 04:05:06 UTC</span></b>
+    built: <b><span class="local-time" data-timestamp="-6792498672871">Saturday, 03-Feb-01 04:05:06 UTC</span></b><br>
+    version: <b>testVersionID</b><br>
   </footer>
 <script>
 (function () {