Add apply_gerrit_ref to bot_update api

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/path',
   'recipe_engine/properties',
 ]
@@ skipping 17 matching lines @@
   force = True if api.properties.get('force') else False
   no_shallow = True if api.properties.get('no_shallow') else False
   output_manifest = api.properties.get('output_manifest', False)
   with_branch_heads = api.properties.get('with_branch_heads', False)
   refs = api.properties.get('refs', [])
   oauth2 = api.properties.get('oauth2', False)
   root_solution_revision = api.properties.get('root_solution_revision')
   suffix = api.properties.get('suffix')
   gerrit_no_reset = True if api.properties.get('gerrit_no_reset') else False
   gerrit_rebase_patch_ref = bool(api.properties.get('gerrit_rebase_patch_ref'))
-  api.bot_update.ensure_checkout(
-      force=force,
-      no_shallow=no_shallow,
-      patch=patch,
-      with_branch_heads=with_branch_heads,
-      output_manifest=output_manifest,
-      refs=refs, patch_oauth2=oauth2,
-      clobber=clobber,
-      root_solution_revision=root_solution_revision,
-      suffix=suffix,
-      gerrit_no_reset=gerrit_no_reset,
-      gerrit_rebase_patch_ref=gerrit_rebase_patch_ref)
+
+  if api.properties.get('test_apply_gerrit_ref'):
+    api.bot_update.apply_gerrit_ref(
+        root='/tmp/test/root',
+        gerrit_no_reset=gerrit_no_reset,
+        gerrit_rebase_patch_ref=gerrit_rebase_patch_ref)
+  else:
+    api.bot_update.ensure_checkout(
+        force=force,
+        no_shallow=no_shallow,
+        patch=patch,
+        with_branch_heads=with_branch_heads,
+        output_manifest=output_manifest,
+        refs=refs, patch_oauth2=oauth2,
+        clobber=clobber,
+        root_solution_revision=root_solution_revision,
+        suffix=suffix,
+        gerrit_no_reset=gerrit_no_reset,
+        gerrit_rebase_patch_ref=gerrit_rebase_patch_ref)
 
 
 def GenTests(api):
   yield api.test('basic') + api.properties(
       mastername='chromium.linux',
       buildername='Linux Builder',
       slavename='totallyaslave-m1',
       patch=False,
       revision='abc'
   )
@@ skipping 96 matching lines @@
       buildername='Experimental Builder',
       slavename='somehost',
       gerrit_no_reset=1
   )
   yield api.test('gerrit_rebase_patch_ref') + api.properties(
       mastername='experimental',
       buildername='Experimental Builder',
       slavename='somehost',
       gerrit_rebase_patch_ref=True
   )
+  yield api.test('apply_gerrit_ref') + api.properties(
+      repository='chromium',
+      gerrit_rebase_patch_ref=True,
+      gerrit_no_reset=1,
+      test_apply_gerrit_ref=True,
+  )
   yield api.test('tryjob_v8') + api.properties(
       mastername='tryserver.chromium.linux',
       buildername='linux_rel',
       slavename='totallyaslave-c4',
       issue=12345,
       patchset=654321,
       patch_url='http://src.chromium.org/foo/bar',
       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',
   )