Move builders.py and steps.py to chromium_tests.

scripts/slave/recipe_modules/gpu/api.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.
 
 from infra.libs.infra_types import freeze
 from recipe_engine import recipe_api
 
 import common
 
 SIMPLE_TESTS_TO_RUN = freeze([
@@ skipping 483 matching lines @@
     # The step test must end in 'test' or 'tests' in order for the results to
     # automatically show up on the flakiness dashboard.
     #
     # Currently all tests on the GPU bots follow this rule, so we can't add
     # code like in chromium/api.py, run_telemetry_test.
 
     target_name = target_name or name
     assert target_name.endswith('test') or target_name.endswith('tests')
 
     results_directory = self.m.path['slave_build'].join('gtest-results', name)
-    return self.m.chromium.steps.GPUGTestTest(
+    return self.m.chromium_tests.steps.GPUGTestTest(
         name,
         xvfb=False,
         args=args,
         target_name=target_name,
         use_isolate=True,
         generate_json_file=True,
         results_directory=results_directory,
         revision=chrome_revision,
         webkit_revision=webkit_revision,
         master_class_name=self._master_class_name_for_testing,
@@ skipping 15 matching lines @@
     if self.m.platform.is_mac and not self.m.tryserver.is_tryserver:
       #TODO(zmo): remove the vmodule flag after crbug.com/424024 is fixed.
       vmodules = [
         'startup_browser_creator=2'
       ]
       extra_browser_args_string += ' --vmodule=' + ','.join(vmodules)
     if extra_browser_args:
       extra_browser_args_string += ' ' + ' '.join(extra_browser_args)
     test_args.append(extra_browser_args_string)
 
-    return self.m.chromium.steps.TelemetryGPUTest(
+    return self.m.chromium_tests.steps.TelemetryGPUTest(
         name, chrome_revision, webkit_revision, args=test_args,
         target_name=target_name, enable_swarming=enable_swarming,
         swarming_dimensions=swarming_dimensions,
         master_class_name=self._master_class_name_for_testing,
         swarming_extra_suffix=self._get_gpu_suffix(swarming_dimensions))