Add mojom_bindings_generator.gypi

mojo/public/bindings/mojom_bindings_generator.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.
 
 """The frontend for the Mojo bindings system."""
 
 
 import os
 import sys
 from optparse import OptionParser
-from parser import mojo_parser
-from parser import mojo_translate
+from parse import mojo_parser
+from parse import mojo_translate
 from generators import mojom_data
 from generators import mojom_cpp_generator
 
 
 def Main():
   parser = OptionParser(usage="usage: %prog [options] filename1 [filename2...]")
   parser.add_option("-i", "--include_dir", dest="include_dir", default=".",
                     help="specify directory for #includes")
   parser.add_option("-o", "--output_dir", dest="output_dir", default=".",
                     help="specify output directory")
   (options, args) = parser.parse_args()
 
   if len(args) < 1:
     parser.print_help()
     sys.exit(1)
 
+  if not os.path.exists(options.output_dir):
+    os.makedirs(options.output_dir)
+
   for filename in args:
     name = os.path.splitext(os.path.basename(filename))[0]
     # TODO(darin): There's clearly too many layers of translation here!  We can
     # at least avoid generating the serialized Mojom IR.
     tree = mojo_parser.Parse(filename)
     mojom = mojo_translate.Translate(tree, name)
     module = mojom_data.ModuleFromData(mojom)
     cpp = mojom_cpp_generator.CPPGenerator(
         module, options.include_dir, options.output_dir)
     cpp.GenerateFiles()
 
 
 if __name__ == '__main__':
   Main()