Add descriptions with examples to run-blink-* scripts.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/cli_wrapper.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 14 matching lines @@
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 """A utility module for making standalone scripts to start servers.
 
 Scripts in Tools/Scripts can use this module to start servers that
 are normally used for layout tests, outside of the layout test runner.
 """
 
+import argparse
 import logging
-import argparse
 
 from webkitpy.common.host import Host
 
 
-def main(server_constructor, input_fn=None, argv=None, **kwargs):
+def main(server_constructor, input_fn=None, argv=None, description=None, **kwargs):
     input_fn = input_fn or raw_input
 
-    parser = argparse.ArgumentParser()
+    parser = argparse.ArgumentParser(description=description, formatter_class=argparse.RawTextHelpFormatter)
     parser.add_argument('--output-dir', type=str, default=None,
                         help='output directory, for log files etc.')
     parser.add_argument('-v', '--verbose', action='store_true',
                         help='print more information, including port numbers')
     args = parser.parse_args(argv)
 
     logging.basicConfig()
     logger = logging.getLogger()
     logger.setLevel(logging.DEBUG if args.verbose else logging.INFO)
 
     host = Host()
     port_obj = host.port_factory.get()
     if not args.output_dir:
         args.output_dir = port_obj.default_results_directory()
 
     # Create the output directory if it doesn't already exist.
     port_obj.host.filesystem.maybe_make_directory(args.output_dir)
 
     server = server_constructor(port_obj, args.output_dir, **kwargs)
     server.start()
     try:
         _ = input_fn('Hit any key to stop the server and exit.')
     except (KeyboardInterrupt, EOFError):
         pass
 
     server.stop()