Apply gerrit ref if it is a Gerrit patch

infra/bots/recipes/swarm_test.py

 # Copyright 2016 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.
 
 
 # Recipe module for Skia Swarming test.
 
 
 DEPS = [
   'build/file',
@@ skipping 413 matching lines @@
 
   # Run DM.
   properties = [
     'gitHash',      api.vars.got_revision,
     'master',       api.vars.master_name,
     'builder',      api.vars.builder_name,
     'build_number', api.vars.build_number,
   ]
   if api.vars.is_trybot:
     properties.extend([
-      'issue',    api.vars.issue,
-      'patchset', api.vars.patchset,
+      'issue',         api.vars.issue,
+      'patchset',      api.vars.patchset,
+      'patch_storage', api.vars.patch_storage,
     ])
 
   args = [
     'dm',
     '--undefok',   # This helps branches that may not know new flags.
     '--resourcePath', api.flavor.device_dirs.resource_dir,
     '--skps', api.flavor.device_dirs.skp_dir,
     '--images', api.flavor.device_path_join(
         api.flavor.device_dirs.images_dir, 'dm'),
     '--colorImages', api.flavor.device_path_join(
@@ skipping 407 matching lines @@
         api.path['slave_build'].join('skia', 'infra', 'bots', 'assets',
                                      'skimage', 'VERSION'),
         api.path['slave_build'].join('skia', 'infra', 'bots', 'assets',
                                      'skp', 'VERSION'),
         api.path['slave_build'].join('skia', 'infra', 'bots', 'assets',
                                      'svg', 'VERSION'),
         api.path['slave_build'].join('tmp', 'uninteresting_hashes.txt')
     ) +
     api.platform('win', 64)
   )
+
+  builder = 'Test-Ubuntu-GCC-GCE-CPU-AVX2-x86-Debug-Trybot'
+  gerrit_kwargs = {
+    'patch_storage': 'gerrit',
+    'repository': 'skia',
+    'event.patchSet.ref': 'refs/changes/00/2100/2',
+    'event.change.number': '2100',
+  }
+  yield (
+      api.test('recipe_with_gerrit_patch') +
+      api.properties(
+          buildername=builder,
+          mastername='client.skia',
+          slavename='skiabot-linux-swarm-000',
+          buildnumber=5,
+          path_config='kitchen',
+          swarm_out_dir='[SWARM_OUT_DIR]',
+          revision='abc123',
+          **gerrit_kwargs)
+  )