new_contents: #!/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.
  #
  # The script follows mojo/services/html_viewer/view_url.py and modified it for
  # test the mojo media renderer. The page will be rendered in a windowless mode.
  #
  # TODO(xhwang): Explore the possibility of running this with the Kiosk window
  # manager.
  
  import argparse
  import os
  import subprocess
  import sys
  
  root_path = os.path.realpath(
      os.path.join(
          os.path.dirname(
              os.path.realpath(__file__)),
          os.pardir,
          os.pardir,
          os.pardir))
  
  def _BuildShellCommand(args):
    sdk_version = subprocess.check_output(["cat",
        "third_party/mojo/src/mojo/public/VERSION"], cwd=root_path)
    build_dir = os.path.join(root_path, args.build_dir)
  
    shell_command = [os.path.join(build_dir, "mojo_shell")]
  
    options = []
    options.append(
        "--origin=https://storage.googleapis.com/mojo/services/linux-x64/%s" %
             sdk_version)
    options.append("--url-mappings=mojo:html_viewer=file://%s/html_viewer.mojo,"
                   "mojo:media=file://%s/media.mojo" % (build_dir, build_dir))
    args_for_html_viewer = "--enable-mojo-media-renderer "
    if args.verbose:
      args_for_html_viewer += \
          "--vmodule=pipeline*=3,*renderer_impl*=3,*mojo_demuxer*=3"
    options.append("--args-for=mojo:html_viewer %s" % args_for_html_viewer)
  
    full_command = shell_command + options + [args.url]
  
    if args.verbose:
      print full_command
  
    return full_command
  
  def main():
    parser = argparse.ArgumentParser(
        description="View a URL with HTMLViewer with mojo media renderer. "
                    "You must have built //mojo/services/html_viewer, "
                    "//mojo/services/network and //media/mojo/services first. "
                    " Note that this will currently often fail spectacularly due "
                    " to lack of binary stability in Mojo.")
    parser.add_argument(
        "--build-dir",
        help="Path to the dir containing the linux-x64 binaries relative to the "
             "repo root (default: %(default)s)",
        default="out/Release")
    parser.add_argument("--verbose", help="Increase output verbosity.",
                        action="store_true")
    parser.add_argument("url",
                        help="The URL to be viewed")
  
    args = parser.parse_args()
    return subprocess.call(_BuildShellCommand(args))
  
  if __name__ == '__main__':
    sys.exit(main())
  
subject: Add script to run/test the mojo media renderer.