Add depot_tools Gerrit presubmit expectations.

scripts/slave/recipes/run_presubmit.py

 # Copyright (c) 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 = [
   'depot_tools/bot_update',
   'depot_tools/gclient',
   'depot_tools/git',
   'depot_tools/presubmit',
   'recipe_engine/json',
@@ skipping 177 matching lines @@
         full_project_name='infra/infra',
         repo_name='infra',
         mastername='tryserver.infra',
         buildername='infra_presubmit',
         runhooks=True) +
     api.step_data('presubmit', api.json.output([['infra_presubmit',
                                                  ['compile']]]))
   )
 
   yield (
+    api.test('depot_tools_and_gerrit') +
+    api.properties.tryserver_gerrit(
+        full_project_name='chromium/tools/depot_tools',
+        repo_name='depot_tools',
+        mastername='tryserver.infra',
+        buildername='presubmit_depot_tools',
+        runhooks=True) +
+    api.step_data('presubmit', api.json.output([['depot_tools_presubmit',
+                                                 ['test']]]))
+  )
+
+  yield (
     api.test('recipes-py') +
     api.properties.tryserver(
         mastername='tryserver.infra',
         buildername='infra_presubmit',
         repo_name='recipes_py',
         patch_project='recipes-py',
         runhooks=True) +
     api.step_data('presubmit', api.json.output([['infra_presubmit',
                                                  ['compile']]]))
   )
@@ skipping 10 matching lines @@
 
   yield (
     api.test('presubmit-infra-failure') +
     api.properties.tryserver(
         mastername='tryserver.chromium.linux',
         buildername='chromium_presubmit',
         repo_name='chromium',
         patch_project='chromium') +
     api.step_data('presubmit', api.json.output({}, retcode=2))
   )