Support variable substitution and tryserver- and waterfall-only cmd line args.

scripts/slave/recipes/android/perf.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.
 
 from recipe_engine.types import freeze
 
 
 DEPS = [
     'adb',
     'bot_update',
@@ skipping 122 matching lines @@
     # (1) the revision of the builder,
     # (2) 'revision' from the waterfall, or
     # (3) 'HEAD' for forced builds with unspecified 'revision'.
     # TODO(machenbach): Use parent_got_cr_revision on testers with component
     # builds to match also the chromium revision from the builder.
     component_rev = api.properties.get(
         'parent_got_revision', api.properties.get('revision') or 'HEAD')
     dep = builder.get('set_component_rev')
     api.gclient.c.revisions[dep['name']] = dep['rev_str'] % component_rev
 
-  api.bot_update.ensure_checkout()
+  bot_update_step = api.bot_update.ensure_checkout()
 
   test_spec_file = builder.get('test_spec_file')
   test_spec = {}
   if test_spec_file:
     test_spec = api.chromium_tests.read_test_spec(api, test_spec_file)
 
     scripts_compile_targets = \
         api.chromium_tests.get_compile_targets_for_scripts().json.output
 
     builder['tests'] = api.chromium_tests.generate_tests_from_test_spec(
         api, test_spec, builder, buildername, mastername, False,
-        scripts_compile_targets, [api.chromium_tests.steps.generate_script])
+        scripts_compile_targets, [api.chromium_tests.steps.generate_script],
+        bot_update_step)
 
   api.path['checkout'] = api.path['slave_build'].join('src')
   api.chromium_android.clean_local_files()
 
   api.chromium_android.download_build(bucket=builder['bucket'],
     path=builder['path'](api))
 
   api.chromium_android.common_tests_setup_steps(perf_setup=True)
 
   api.chromium_android.adb_install_apk('ChromePublic.apk')
@@ skipping 115 matching lines @@
           mastername='chromium.perf',
           buildername='Android Nexus5 Perf (1)',
           parent_buildername='parent_buildername',
           parent_buildnumber='1729',
           parent_revision='deadbeef',
           revision='deadbeef',
           slavename='slavename',
           target='Release') +
       api.override_step_data(
           'perf_test.foo', retcode=87))