De-duplicate steps between chromium and chromium_trybot recipes

scripts/slave/recipes/blink_trybot.py

Index: scripts/slave/recipes/blink_trybot.py
diff --git a/scripts/slave/recipes/blink_trybot.py b/scripts/slave/recipes/blink_trybot.py
index 66d4bdda829f70dd65762be1af5f39e1accdba3b..099a69a5144d8f566aac10cfb77160bcfe178e7d 100644
--- a/scripts/slave/recipes/blink_trybot.py
+++ b/scripts/slave/recipes/blink_trybot.py
@@ -244,7 +244,7 @@ BUILDERS = {
 
 
 def GenSteps(api):
-  class BlinkTest(api.test_utils.Test):
+  class BlinkTest(api.chromium.steps.Test):
     name = 'webkit_tests'
 
     def __init__(self):
@@ -252,13 +252,13 @@ def GenSteps(api):
       self.layout_test_wrapper = api.path['build'].join(
           'scripts', 'slave', 'chromium', 'layout_test_wrapper.py')
 
-    def run(self, suffix):
+    def run(self, api, suffix):
       args = ['--target', api.chromium.c.BUILD_CONFIG,
               '-o', self.results_dir,
               '--build-dir', api.chromium.c.build_dir,
               '--json-test-results', api.json.test_results(add_json_log=False)]
       if suffix == 'without patch':
-        test_list = "\n".join(self.failures('with patch'))
+        test_list = "\n".join(self.failures(api, 'with patch'))
         args.extend(['--test-list', api.raw_io.input(test_list),
                      '--skipped', 'always'])
 
@@ -318,7 +318,7 @@ def GenSteps(api):
           followup_fn=archive_webkit_tests_results_followup
         )
 
-    def has_valid_results(self, suffix):
+    def has_valid_results(self, api, suffix):
       step = api.step_history[self._step_name(suffix)]
       # TODO(dpranke): crbug.com/357866 - note that all comparing against
       # MAX_FAILURES_EXIT_STATUS tells us is that we did not exit early
@@ -330,7 +330,7 @@ def GenSteps(api):
       return (step.json.test_results.valid and
               step.retcode <= step.json.test_results.MAX_FAILURES_EXIT_STATUS)
 
-    def failures(self, suffix):
+    def failures(self, api, suffix):
       sn = self._step_name(suffix)
       return api.step_history[sn].json.test_results.unexpected_failures
 
@@ -426,7 +426,8 @@ def GenSteps(api):
         api.chromium.compile(always_run=True),
       )
 
-    yield api.test_utils.determine_new_failures([BlinkTest()], deapply_patch_fn)
+    yield api.test_utils.determine_new_failures(
+        api, [BlinkTest()], deapply_patch_fn)
 
 
 def _sanitize_nonalpha(text):