Fix revision for WebRTC patches sent to Chromium trybots

recipe_modules/gclient/example.py

 # Copyright 2013 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 = [
   'gclient',
   'recipe_engine/path',
   'recipe_engine/properties',
 ]
 
@@ skipping 73 matching lines @@
       cwd=api.path['slave_build'].join('src', 'third_party'))
 
   api.gclient.break_locks()
 
   del api.gclient.spec_alias
 
   api.gclient.runhooks()
 
   assert not api.gclient.is_blink_mode
 
+  if api.properties.get('patch_project'):
+    api.gclient.set_patch_project_revision(
+        patch_project=api.properties.get('patch_project'),
+        gclient_config=api.gclient.make_config('chromium_bare'))
+
 
 def GenTests(api):
   yield api.test('basic')
 
   yield api.test('revision') + api.properties(revision='abc')
 
   yield api.test('tryserver') + api.properties.tryserver()
+
+  yield (
+      api.test('tryserver_webrtc_patch') +
+      api.properties.tryserver(patch_project='webrtc')
+  )