Move recipe engine to third_party/recipe_engine.

scripts/tools/runit.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 """Runs a command with PYTHONPATH set up for the Chromium build setup.
 
 This is helpful for running scripts locally on a development machine.
 
 Try `scripts/common/runit.py python`
 or  (in scripts/slave): `../common/runit.py runtest.py --help`
 """
 
 import optparse
 import os
 import subprocess
 import sys
 
 # Import 'common.env' to load our Infra PYTHONPATH
 sys.path.insert(0, os.path.join(
     os.path.dirname(os.path.realpath(__file__)), os.pardir))
 import common.env
 
 USAGE = '%s [options] <command to run>' % os.path.basename(sys.argv[0])
 
-# These third_party libs interfere with other imports in PYTHONPATH and should
-# be put last. Please file bugs to clean up each entry here.
-troublemakers = []
-
 
 def main():
   option_parser = optparse.OptionParser(usage=USAGE)
   option_parser.add_option('-s', '--show-path', action='store_true',
                            help='display new PYTHONPATH before running command')
   option_parser.disable_interspersed_args()
   options, args = option_parser.parse_args()
   if not args:
     option_parser.error('Must provide a command to run.')
 
   # If the first argument is 'python', replace it with the system executable.
   if args[0] == 'python':
     args[0] = sys.executable
 
   with common.env.GetInfraPythonPath().Enter():
     if options.show_path:
       print 'Set PYTHONPATH: %s' % os.environ['PYTHONPATH']
     # Use subprocess instead of execv because otherwise windows destroys
     # quoting.
     p = subprocess.Popen(args)
     p.wait()
     return p.returncode
 
 
 if __name__ == '__main__':
   sys.exit(main())