[tools] Fix typo in callstats.py

tools/callstats.py

 #!/usr/bin/env python
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 '''
 Usage: callstats.py [-h] <command> ...
 
 Optional arguments:
   -h, --help  show this help message and exit
 
@@ skipping 28 matching lines @@
   def fix_for_printing(arg):
     m = re.match(r'^--([^=]+)=(.*)$', arg)
     if m and (' ' in m.group(2) or m.group(2).startswith('-')):
       arg = "--{}='{}'".format(m.group(1), m.group(2))
     elif ' ' in arg:
       arg = "'{}'".format(arg)
     return arg
   print " ".join(map(fix_for_printing, cmd_args))
 
 
-def start_replay_server(args, sites):
+def start_replay_server(args, sites, discard_output=True):
   with tempfile.NamedTemporaryFile(prefix='callstats-inject-', suffix='.js',
                                    mode='wt', delete=False) as f:
     injection = f.name
     generate_injection(f, sites, args.refresh)
   http_port = 4080 + args.port_offset
   https_port = 4443 + args.port_offset
   cmd_args = [
       args.replay_bin,
       "--port=%s" % http_port,
       "--ssl_port=%s" % https_port,
       "--no-dns_forwarding",
       "--use_closest_match",
       "--no-diff_unknown_requests",
       "--inject_scripts=deterministic.js,{}".format(injection),
       args.replay_wpr,
   ]
   print "=" * 80
   print_command(cmd_args)
-  with open(os.devnull, 'w') as null:
-    server = subprocess.Popen(cmd_args, stdout=null, stderr=null)
+  if discard_output:
+    with open(os.devnull, 'w') as null:
+      server = subprocess.Popen(cmd_args, stdout=null, stderr=null)
+  else:
+      server = subprocess.Popen(cmd_args)
   print "RUNNING REPLAY SERVER: %s with PID=%s" % (args.replay_bin, server.pid)
   print "=" * 80
   return {'process': server, 'injection': injection}
 
 
 def stop_replay_server(server):
   print("SHUTTING DOWN REPLAY SERVER %s" % server['process'].pid)
   server['process'].terminate()
   os.remove(server['injection'])
 
@@ skipping 205 matching lines @@
 
 
 def do_run_replay_server(args):
   sites = read_sites(args)
   print("- " * 40)
   print("Available URLs:")
   for site in sites:
     print("    "+site['url'])
   print("- " * 40)
   print("Launch chromium with the following commands for debugging:")
-  flags = get_chrome_flags("'--runtime-calls-stats --allow-natives-syntax'",
+  flags = get_chrome_flags("'--runtime-call-stats --allow-natives-syntax'",
                            "/var/tmp/`date +%s`")
   flags += get_chrome_replay_flags(args)
   print("    $CHROMIUM_DIR/out/Release/chomium " + (" ".join(flags)) + " <URL>")
   print("- " * 40)
-  replay_server = start_replay_server(args, sites)
+  replay_server = start_replay_server(args, sites, discard_output=False)
   try:
     replay_server['process'].wait()
   finally:
    stop_replay_server(replay_server)
 
 
 # Calculate statistics.
 
 def statistics(data):
   N = len(data)
@@ skipping 366 matching lines @@
     args.error("use either option --sites-file or site URLs")
     sys.exit(1)
   elif args.command == "run" and not coexist(args.replay_wpr, args.replay_bin):
     args.error("options --replay-wpr and --replay-bin must be used together")
     sys.exit(1)
   else:
     args.func(args)
 
 if __name__ == "__main__":
   sys.exit(main())