Speed up fremontcut/dartdomgenerator

lib/html/scripts/fremontcutbuilder.py

 #!/usr/bin/python
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import database
 import databasebuilder
 import idlparser
 import logging.config
 import os.path
@@ skipping 113 matching lines @@
         'DOMApplicationCache': 'ApplicationCache',
         'DOMCoreException': 'DOMException',
         'DOMFormData': 'FormData',
         'DOMSelection': 'Selection',
         'DOMWindow': 'Window',
         'SharedWorkerContext': 'SharedWorkerGlobalScope',
         'WorkerContext': 'WorkerGlobalScope',
       })
 
   # Import WebKit IDLs.
-  for file_name in idl_files:
-    builder.import_idl_file(file_name, webkit_options)
+  builder.import_idl_files(idl_files, webkit_options)
 
   # Import Dart idl:
   dart_options = databasebuilder.DatabaseBuilderOptions(
     idl_syntax=idlparser.FREMONTCUT_SYNTAX,
     source='Dart',
     rename_operation_arguments_on_merge=True)
 
-  builder.import_idl_file(
-      os.path.join(current_dir, '..', 'idl', 'dart', 'dart.idl'),
+  builder.import_idl_files(
+      [ os.path.join(current_dir, '..', 'idl', 'dart', 'dart.idl') ],
       dart_options)
 
   # Merging:
   builder.merge_imported_interfaces()
 
   builder.fetch_constructor_data(webkit_options)
   builder.fix_displacements('WebKit')
 
   # Cleanup:
   builder.normalize_annotations(['WebKit', 'Dart'])
 
   db.Save()
+  return db
 
 def main():
   current_dir = os.path.dirname(__file__)
 
   webkit_dirs = [
     'css',
     'dom',
     'fileapi',
     'html',
     'html/canvas',
@@ skipping 41 matching lines @@
 
   for dir_name in webkit_dirs:
     dir_path = os.path.join(webcore_dir, dir_name)
     os.path.walk(dir_path, visitor, None)
 
   database_dir = os.path.join(current_dir, '..', 'database')
   return build_database(idl_files, database_dir)
 
 if __name__ == '__main__':
   sys.exit(main())