Add wrapper script for GPU integration tests, supporting sharding.

content/test/gpu/run_gpu_integration_test.py

 #!/usr/bin/env python
 # Copyright 2016 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 argparse
 import json
 import sys
 
 from gpu_tests import path_util
 import gpu_project_config
 
 path_util.SetupTelemetryPaths()
 
 from telemetry.testing import browser_test_runner
 
-abbr_json_arg = '--write-abbreviated-json-results-to='
-
 def PostprocessJSON(file_name):
   def TrimPrefix(s):
     return s[1 + s.rfind('.'):]
   with open(file_name) as f:
     test_result = json.load(f)
   test_result['successes'] = map(TrimPrefix, test_result['successes'])
   test_result['failures'] = map(TrimPrefix, test_result['failures'])
   with open(file_name, 'w') as f:
     json.dump(test_result, f)
 
 def main():
   options = browser_test_runner.TestRunOptions()
   rest_args = sys.argv[1:]
   retval = browser_test_runner.Run(
       gpu_project_config.CONFIG, options, rest_args)
   # Postprocess the outputted JSON to trim all of the prefixes from
   # the test names, to keep them as similar to the old form as
   # possible -- and keep them from getting crazily long.
-  for arg in rest_args:
-    if arg.startswith(abbr_json_arg):
-      PostprocessJSON(arg[len(abbr_json_arg):])
-      break
+  parser = argparse.ArgumentParser(description='Temporary argument parser')
+  parser.add_argument(
+    '--write-abbreviated-json-results-to', metavar='FILENAME',
+    action='store',
+    help=('Full path for json results'))
+  option, _ = parser.parse_known_args(rest_args)
+  if option.write_abbreviated_json_results_to:
+    PostprocessJSON(option.write_abbreviated_json_results_to)
 
 if __name__ == '__main__':
   sys.exit(main())