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

scripts/slave/recipes/chromium.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 = [
   'adb',
   'amp',
   'bisect_tester',
   'bot_update',
   'chromium',
@@ skipping 273 matching lines @@
                            parent_buildername='Linux Builder') +
     api.properties(swarm_hashes={
       'telemetry_gpu_unittests': 'eeeeeeeeeeeeeeeeeeeeeeeeeeeeee',
     }) +
     api.platform('linux', 64) +
     api.override_step_data('read test spec', api.json.output({
       'Linux Tests': {
         'isolated_scripts': [
           {
             'isolate_name': 'telemetry_gpu_unittests',
-            'name': 'telemetry_gpu_unittests'
+            'name': 'telemetry_gpu_unittests',
+            'args': ['--correct-common-arg'],
+            'precommit_args': ['--SHOULD-NOT-BE-PRESENT-DURING-THE-RUN'],
+            'non_precommit_args': [
+              '--these-args-should-be-present',
+              '--test-machine-name=\"${buildername}\"',
+              '--build-revision=\"${got_revision}\"',
+            ],
           },
         ],
       },
     }))
   )
 
   yield (
     api.test('build_dynamic_isolated_script_test_compile_target_overriden') +
     api.properties.generic(mastername='chromium.linux',
                            buildername='Linux Builder') +
@@ skipping 630 matching lines @@
     api.test('chromium_linux_Android_Tests_logcat_upload_timeout') +
     api.properties(
         mastername='chromium.linux',
         buildername='Android Tests',
         slavename='build1-a1',
         buildnumber='77457',
         parent_buildername='Android Builder',
     ) +
     api.override_step_data('gsutil upload', retcode=-2001)
   )