my_activity.py: Include AOSP gerrit instance.

Several Chromium OS projects were moved to AOSP so now the development
is in that gerrit instance. This patch includes it to the list.

BUG=None
TEST=`my_activity.py` shows changes in the AOSP gerrit instance.

Review URL: https://codereview.chromium.org/1332723002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@296634 0039d316-1c4b-4281-b951-d872f2087c98

my_activity.py

@@ -95,6 +95,9 @@ gerrit_instances = [
     'url': 'chrome-internal-review.googlesource.com',
     'shorturl': 'crosreview.com/i',
   },
+  {
+    'url': 'android-review.googlesource.com',
+  },
 ]
 
 google_code_projects = [