my_activity: add short url for android CLs

Change-Id: I7e9c7c38b82d746cad28685f0eb8e24cc2f41572
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2079412
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

my_activity.py

@@ -72,6 +72,8 @@ class DefaultFormatter(Formatter):
 gerrit_instances = [
   {
     'url': 'android-review.googlesource.com',
+    'shorturl': 'r.android.com',
+    'short_url_protocol': 'https',
   },
   {
     'url': 'chrome-internal-review.googlesource.com',