Don't write generated C++ bindings twice, only once.

tools/dom/scripts/dartdomgenerator.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.
 
 """This is the entry point to create Dart APIs from the IDL database."""
 
 import dartgenerator
 import database
 import fremontcutbuilder
-import logging.config
+import logging
 import monitored
 import multiemitter
 import optparse
 import os
 import shutil
 import subprocess
 import sys
 from dartmetadata import DartMetadata
 from generator import TypeRegistry
 from htmleventgenerator import HtmlEventGenerator
@@ skipping 110 matching lines @@
 
     RunGenerator(dart_libraries, dart_output_dir,
                  template_loader, backend_factory)
     cpp_library_emitter.EmitDerivedSources(
         template_loader.Load('cpp_derived_sources.template'),
         dartium_output_dir)
     cpp_library_emitter.EmitResolver(
         template_loader.Load('cpp_resolver.template'), dartium_output_dir)
     cpp_library_emitter.EmitClassIdTable(
         webkit_database, dartium_output_dir, type_registry, renamer)
+    emitters.Flush()
 
   if update_dom_metadata:
     metadata.Flush()
 
   monitored.FinishMonitoring(dart2js_output_dir)
 
 def GenerateSingleFile(library_path, output_dir, generated_output_dir=None):
   library_dir = os.path.dirname(library_path)
   library_filename = os.path.basename(library_path)
   copy_dart_script = os.path.relpath('../../copy_dart.py',
@@ skipping 63 matching lines @@
           os.path.join('..', '..', '..', 'sdk', 'lib', library_name, 'dart2js'))
   if 'htmldartium' in systems:
     _logger.info('Generating dartium single files.')
     for library_name in HTML_LIBRARY_NAMES:
       GenerateSingleFile(
           os.path.join(dartium_output_dir, '%s_dartium.dart' % library_name),
           os.path.join('..', '..', '..', 'sdk', 'lib', library_name, 'dartium'))
 
 if __name__ == '__main__':
   sys.exit(main())