[telemetry] Automatic hash file creation and upload to Cloud Storage.

tools/perf/PRESUBMIT.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.
 import os
 import sys
 
+
 PYLINT_BLACKLIST = []
 PYLINT_DISABLED_WARNINGS = ['R0923', 'R0201', 'E1101']
 
+
 def _CommonChecks(input_api, output_api):
   results = []
   old_sys_path = sys.path
   try:
-    sys.path = [os.path.join('..', 'telemetry')] + sys.path
+    sys.path = [os.path.join(os.pardir, 'telemetry')] + sys.path
     results.extend(input_api.canned_checks.RunPylint(
         input_api, output_api,
         black_list=PYLINT_BLACKLIST,
         disabled_warnings=PYLINT_DISABLED_WARNINGS))
   finally:
     sys.path = old_sys_path
   return results
 
+
 def CheckChangeOnUpload(input_api, output_api):
   report = []
   report.extend(_CommonChecks(input_api, output_api))
   return report
 
+
 def CheckChangeOnCommit(input_api, output_api):
   report = []
   report.extend(_CommonChecks(input_api, output_api))
   return report