Makes filter step continue on if error

scripts/slave/recipe_modules/filter/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 = [
   'chromium',
   'filter',
   'json',
   'path',
   'properties',
   'raw_io',
+  'step',
 ]
 
 def GenSteps(api):
   api.path['checkout'] = api.path['slave_build']
   api.chromium.set_config('chromium')
   api.filter.does_patch_require_compile()
   assert (api.filter.result and api.properties['example_result']) or \
       (not api.filter.result and not api.properties['example_result'])
   assert (not api.properties['example_matching_exes'] or
           list(api.properties['example_matching_exes']) ==
           api.filter.matching_exes)
+  api.step('hello', ['echo', 'Why hello, there.'])
 
 def GenTests(api):
   # Trivial test with no exclusions and nothing matching.
   yield (api.test('basic') +
          api.properties(filter_exclusions=[]) +
          api.properties(example_result=None) +
          api.properties(example_matching_exes=None) +
          api.override_step_data(
           'git diff to analyze patch',
           api.raw_io.stream_output('yy')))
@@ skipping 36 matching lines @@
                                   'targets': ['foo']})))
 
   # Analyze with error condition.
   yield (api.test('analyzes_error') +
          api.properties(matching_exes=None) +
          api.properties(example_matching_exes=None) +
          api.properties(example_result=1) +
          api.override_step_data(
           'analyze',
           api.json.output({'error': 'ERROR'})))
+
+  # Analyze with python returning bad status.
+  yield (api.test('bad_retcode_doesnt_fail') +
+         api.properties(matching_exes=None) +
+         api.properties(example_matching_exes=None) +
+         api.properties(example_result=1) +
+         api.step_data(
+          'analyze',
+          retcode=-1))