Update from https://crrev.com/327068

testing/scripts/gtest_perf_test.py

 #!/usr/bin/env python
 # 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 json
 import os
 import sys
 
 
 import common
 
 
+def IsWindows():
+  return sys.platform == 'cygwin' or sys.platform.startswith('win')
+
+
 def main_run(args):
   filter_tests = []
   if args.filter_file:
     filter_tests = json.load(args.filter_file)
 
   perf_id = args.properties.get('perf-id')
   script_args = args.args
   test_suite = script_args[0]
+  if IsWindows():
+    script_args[0] += '.exe'
 
   with common.temporary_file() as tempfile_path:
     gtest_args = [
           '--target', args.build_config_fs,
           '--annotate', 'graphing',
           '--perf-id', perf_id,
           '--perf-dashboard-id', test_suite,
           '--results-url', args.properties.get('results-url'),
           '--slave-name', args.properties.get('slavename'),
           '--builder-name', args.properties.get('buildername'),
@@ skipping 34 matching lines @@
   else:
     json.dump(['$name'], args.output)
 
 
 if __name__ == '__main__':
   funcs = {
     'run': main_run,
     'compile_targets': main_compile_targets,
   }
   sys.exit(common.run_script(sys.argv[1:], funcs))