Setting --run-python-script flag for runtest.py invocation.

scripts/slave/recipe_modules/bisect_tester/perf_test.py

 # Copyright 2015 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 re
 import time
 
 from . import parse_metric
 
@@ skipping 181 matching lines @@
   command_parts = command.split()
   stdout = api.m.raw_io.output()
   stderr = api.m.raw_io.output()
 
   # TODO(prasadv): Remove this once bisect runs are no longer running
   # against revisions from February 2016 or earlier.
   kwargs = {}
   if 'android-chrome' in command:  # pragma: no cover
     kwargs['env'] = {'CHROMIUM_OUTPUT_DIR': api.m.chromium.output_dir}
 
+  # By default, we assume that the test to run is an executable binary. In the
+  # case of python scripts, runtest.py will guess based on the extension.
+  python_mode = False
+  if command_parts[0] == 'python':  # pragma: no cover
+    # Dashboard prepends the command with 'python' when on windows, however, it
+    # is not necessary to pass this along to the runtest.py invocation.
+    # TODO(robertocn): Remove this clause when dashboard stops sending python as
+    # part of the command.
+    # https://github.com/catapult-project/catapult/issues/2283
+    command_parts = command_parts[1:]
+    python_mode = True
+  elif _is_telemetry_command(command):
+    # run_benchmark is a python script without an extension, hence we force
+    # python mode.
+    python_mode = True
   try:
     step_result = api.m.chromium.runtest(
         test=_rebase_path(command_parts[0]),
         args=command_parts[1:],
         xvfb=True,
         name=step_name,
+        python_mode=python_mode,
         stdout=stdout,
         stderr=stderr,
         **kwargs)
     step_result.presentation.logs['Captured Output'] = (
         step_result.stdout or '').splitlines()
   except api.m.step.StepFailure as sf:
     sf.result.presentation.logs['Failure Output'] = (
         sf.result.stdout or '').splitlines()
     if sf.result.stderr:  # pragma: no cover
       sf.result.presentation.logs['stderr'] = (
         sf.result.stderr).splitlines()
     return sf.result.stdout, sf.result.stderr, sf.result.retcode
   return step_result.stdout, step_result.stderr, step_result.retcode