[NaCl SDK] Convert python scripts from optparse to argparse.

native_client_sdk/src/tools/tests/chrome_mock.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 optparse
+"""Mock chrome process used by test code for http server."""
+
+import argparse
 import sys
 import time
 import urllib2
 
 def PrintAndFlush(s):
-  print s
+  sys.stdout.write(s + '\n')
   sys.stdout.flush()
 
 def main(args):
-  parser = optparse.OptionParser(usage='%prog [options] <URL to load>')
-  parser.add_option('--post', help='POST to URL.', dest='post',
-                    action='store_true')
-  parser.add_option('--get', help='GET to URL.', dest='get',
-                    action='store_true')
-  parser.add_option('--sleep',
-                    help='Number of seconds to sleep after reading URL',
-                    dest='sleep', default=0)
-  parser.add_option('--expect-to-be-killed', help='If set, the script will warn'
-                    ' if it isn\'t killed before it finishes sleeping.',
-                    dest='expect_to_be_killed', action='store_true')
-  options, args = parser.parse_args(args)
-  if len(args) != 1:
-    parser.error('Expected URL to load.')
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('--post', help='POST to URL.', dest='post',
+                      action='store_true')
+  parser.add_argument('--get', help='GET to URL.', dest='get',
+                      action='store_true')
+  parser.add_argument('--sleep',
+                      help='Number of seconds to sleep after reading URL',
+                      dest='sleep', default=0)
+  parser.add_argument('--expect-to-be-killed', help='If set, the script will'
+                      ' warn if it isn\'t killed before it finishes sleeping.',
+                      dest='expect_to_be_killed', action='store_true')
+  parser.add_argument('url')
+
+  options = parser.parse_args(args)
 
   PrintAndFlush('Starting %s.' % sys.argv[0])
 
   if options.post:
-    urllib2.urlopen(args[0], data='').read()
+    urllib2.urlopen(options.url, data='').read()
   elif options.get:
-    urllib2.urlopen(args[0]).read()
+    urllib2.urlopen(options.url).read()
   else:
     # Do nothing but wait to be killed.
     pass
 
   time.sleep(float(options.sleep))
 
   if options.expect_to_be_killed:
     PrintAndFlush('Done sleeping. Expected to be killed.')
-  sys.exit(0)
+  return 0
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))