Add support for generating thunk source from IDL.

ppapi/generators/generator.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 import os
 import sys
 import traceback
 
 # Note: some of these files are imported to register cmdline options.
 from idl_generator import Generator
 from idl_option import ParseOptions
 from idl_outfile import IDLOutFile
 from idl_parser import ParseFiles
 from idl_c_header import HGen
+from idl_thunk import TGen
 from idl_gen_pnacl import PnaclGen
 
 
 def Main(args):
   # If no arguments are provided, assume we are trying to rebuild the
   # C headers with warnings off.
   try:
     if not args:
       args = [
           '--wnone', '--cgen', '--range=start,end',
           '--pnacl', '--pnaclshim',
           '../native_client/src/untrusted/pnacl_irt_shim/pnacl_shim.c',
+          '--tgen',
       ]
       current_dir = os.path.abspath(os.getcwd())
       script_dir = os.path.abspath(os.path.dirname(__file__))
       if current_dir != script_dir:
         print '\nIncorrect CWD, default run skipped.'
         print 'When running with no arguments set CWD to the scripts directory:'
         print '\t' + script_dir + '\n'
         print 'This ensures correct default paths and behavior.\n'
         return 1
 
     filenames = ParseOptions(args)
     ast = ParseFiles(filenames)
     if ast.errors:
       print 'Found %d errors.  Aborting build.\n' % ast.errors
       return 1
     return Generator.Run(ast)
   except SystemExit, ec:
     print 'Exiting with %d' % ec.code
     sys.exit(ec.code)
 
   except:
     typeinfo, value, tb = sys.exc_info()
     traceback.print_exception(typeinfo, value, tb)
     print 'Called with: ' + ' '.join(sys.argv)
 
 
 if __name__ == '__main__':
     sys.exit(Main(sys.argv[1:]))
-