bot_update: understand new Gerrit patch properties.

recipe_modules/bot_update/example.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 DEPS = [
   'bot_update',
   'gclient',
   'recipe_engine/platform',
   'recipe_engine/path',
   'recipe_engine/properties',
@@ skipping 123 matching lines @@
   yield api.test('tryjob_v8') + api.properties(
       issue=12345,
       patchset=654321,
       rietveld='https://rietveld.example.com/',
       patch_project='v8',
       revisions={'src/v8': 'abc'}
   )
   yield api.test('tryjob_v8_head_by_default') + api.properties.tryserver(
       patch_project='v8',
   )
-  yield api.test('tryjob_gerrit_angle') + api.properties.tryserver_gerrit(
-      full_project_name='angle/angle',
+  yield api.test('tryjob_gerrit_angle') + api.properties.tryserver(
+      gerrit_project='angle/angle',
+      patch_issue=338811,
+      patch_set=3,
   )
+  yield (api.test('tryjob_gerrit_angle_deprecated') +
+         api.properties.tryserver_gerrit(full_project_name='angle/angle')
+  )