Add a presubmit script and pylintrc for content/test/gpu

content/test/gpu/gpu_tests/pixel.py

 # Copyright (c) 2012 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 datetime import datetime
 import glob
 import json
-import optparse
 import os
 import re
 
-import cloud_storage_test_base
+from gpu_tests import cloud_storage_test_base
+from gpu_tests import pixel_expectations
 import page_sets
-import pixel_expectations
 
 from catapult_base import cloud_storage
 from telemetry.page import page_test
 from telemetry.util import image_util
 
 
 test_data_dir = os.path.abspath(os.path.join(
     os.path.dirname(__file__), '..', '..', 'data', 'gpu'))
 
 default_reference_image_dir = os.path.join(test_data_dir, 'gpu_reference')
@@ skipping 69 matching lines @@
         ref_png = screenshot
       else:
         # There was a preexisting reference image, so we might as well
         # compare against it.
         ref_png = self._DownloadFromCloudStorage(image_name, page, tab)
     elif self.options.download_refimg_from_cloud_storage:
       # This bot doesn't have the ability to properly generate a
       # reference image, so download it from cloud storage.
       try:
         ref_png = self._DownloadFromCloudStorage(image_name, page, tab)
-      except cloud_storage.NotFoundError as e:
+      except cloud_storage.NotFoundError:
         # There is no reference image yet in cloud storage. This
         # happens when the revision of the test is incremented or when
         # a new test is added, because the trybots are not allowed to
         # produce reference images, only the bots on the main
         # waterfalls. Report this as a failure so the developer has to
         # take action by explicitly suppressing the failure and
         # removing the suppression once the reference images have been
         # generated. Otherwise silent failures could happen for long
         # periods of time.
         raise page_test.Failure('Could not find image %s in cloud storage' %
@@ skipping 70 matching lines @@
 
   def CreateStorySet(self, options):
     story_set = page_sets.PixelTestsStorySet(self.GetExpectations(),
                                              try_es3=True)
     for page in story_set:
       page.script_to_evaluate_on_commit = test_harness_script
     return story_set
 
   def _CreateExpectations(self):
     return pixel_expectations.PixelExpectations()