Prevent modifying path separator on Windows by shlex.split()

tools/bisect-perf-regression.py

 #!/usr/bin/env python
 # Copyright (c) 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.
 
 """Performance Test Bisect Tool
 
 This script bisects a series of changelists using binary search. It starts at
 a bad revision where a performance metric has regressed, and asks for a last
 known-good revision. It will then binary search across this revision range by
@@ skipping 2076 matching lines @@
 
     if self.opts.debug_ignore_perf_test:
       fake_results = {
           'mean': 0.0,
           'std_err': 0.0,
           'std_dev': 0.0,
           'values': [0.0]
       }
       return (fake_results, success_code)
 
-    args = shlex.split(command_to_run)
+    # For Windows platform set posix=False, to parse windows paths correctly.
+    # On Windows, path separators '\' or '\\' are replace by '' when posix=True,
+    # refer to http://bugs.python.org/issue1724822. By default posix=True.
+    args = shlex.split(command_to_run, posix=not IsWindows())
 
     if not self._GenerateProfileIfNecessary(args):
       err_text = 'Failed to generate profile for performance test.'
       return (err_text, failure_code)
 
     # If running a Telemetry test for Chrome OS, insert the remote IP and
     # identity parameters.
     is_telemetry = bisect_utils.IsTelemetryCommand(command_to_run)
     if self.opts.target_platform == 'cros' and is_telemetry:
       args.append('--remote=%s' % self.opts.cros_remote_ip)
@@ skipping 1797 matching lines @@
       # The perf dashboard scrapes the "results" step in order to comment on
       # bugs. If you change this, please update the perf dashboard as well.
       bisect_utils.OutputAnnotationStepStart('Results')
     print 'Error: %s' % e.message
     if opts.output_buildbot_annotations:
       bisect_utils.OutputAnnotationStepClosed()
   return 1
 
 if __name__ == '__main__':
   sys.exit(main())