Display Short URLs in Issues

This change adds the functionality to display Short URLs for issues if possible.

BUG=

Change-Id: I250f3609e853663b576b8ff1c7e27e264b179755
Reviewed-on: https://chromium-review.googlesource.com/426318
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>

my_activity.py

@@ -433,6 +433,9 @@ class MyActivity(object):
               instance["name"], item["id"]),
           "comments": []
         }
+        if 'shorturl' in instance:
+          issue['url'] = 'http://%s/%d' % (instance['shorturl'], item['id'])
+
         if 'owner' in item:
           issue['owner'] = item['owner']['name']
         else: