Introduce dartanalyze into our build.

mojo/tools/mojob.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 # This a simple script to make building/testing Mojo components easier.
 
 import argparse
 from copy import deepcopy
 import os
@@ skipping 94 matching lines @@
                'ensure_start']
     exit_code = subprocess.call(command)
     if exit_code:
       return exit_code
 
     return subprocess.call(['ninja', '-j', '1000', '-l', '100', '-C', out_dir])
   else:
     return subprocess.call(['ninja', '-C', out_dir])
 
 
+def dartcheck(config):
+  """Runs the dart analyzer on code for the given config."""
+
+  out_dir = _get_out_dir(config)
+  print 'Checking dart code in %s ...' % out_dir
+  return subprocess.call(['ninja', '-C', out_dir, 'dartcheck'])
+
+
 def _run_tests(config, test_types):
   """Runs the tests of the given type(s) for the given config."""
 
   assert isinstance(test_types, list)
   config = deepcopy(config)
   config.values['test_types'] = test_types
 
   test_list = GetTestList(config)
   dry_run = config.values.get('dry_run')
   final_exit_code = 0
@@ skipping 112 matching lines @@
   perftest_parser.set_defaults(func=perftest)
 
   pytest_parser = subparsers.add_parser('pytest', parents=[parent_parser],
       help='Run Python unit tests (does not build).')
   pytest_parser.set_defaults(func=pytest)
 
   nacltest_parser = subparsers.add_parser('nacltest', parents=[parent_parser],
       help='Run NaCl unit tests (does not build).')
   nacltest_parser.set_defaults(func=nacltest)
 
+  dartcheck_parser = subparsers.add_parser('dartcheck', parents=[parent_parser],
+      help='Run the dart source code analyzer to check for warnings.')
+  dartcheck_parser.set_defaults(func=dartcheck)
+
   args = parser.parse_args()
   config = _args_to_config(args)
   return args.func(config)
 
 
 if __name__ == '__main__':
   sys.exit(main())