Fixup Sky and Mojo dart pkg's exported mojoms

mojo/public/tools/dart_list_mojoms.py

 #!/usr/bin/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.
 
 # This script scans a directory tree for any .mojom files and outputs a list.
 
 import argparse
 import os
 import sys
 
 def main(args):
   parser = argparse.ArgumentParser(
       description='Prints list of generated dart binding source files.')
   parser.add_argument('source_directory',
                       metavar='source_directory',
                       help='Path to source directory tree containing .mojom'
                            ' files')
   parser.add_argument('relative_directory_root',
                       metavar='relative_directory_root',
                       help='Path to directory which all outputted paths will'
                            'be relative to.')
   args = parser.parse_args()
   # Directory to start searching for .mojom files.
   source_directory = args.source_directory
   # Prefix to chop off output.
   root_prefix = os.path.abspath(args.relative_directory_root)
-  for dirname, _, filenames in os.walk(source_directory):
+  for dirname, dirnames, filenames in os.walk(source_directory):
     # filter for .mojom files.
     filenames = [f for f in filenames if f.endswith('.mojom')]
+    # Skip any directories that start with 'test'.
+    dirnames[:] = [d for d in dirnames if not d.startswith('test')]
     for f in filenames:
       path = os.path.abspath(os.path.join(dirname, f))
       path = os.path.relpath(path, root_prefix)
       print(path)
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))