Fixing SVGColor DartC break

tools/dom/scripts/systemnative.py

 #!/usr/bin/python
 # Copyright (c) 2012, 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 module provides shared functionality for the systems to generate
 native binding from the IDL database."""
 
 import emitter
 import os
@@ skipping 134 matching lines @@
         'static void constructorCallback(Dart_NativeArguments args)\n'
         '{\n'
         '    WebCore::DartArrayBufferViewInternal::constructWebGLArray<Dart$(INTERFACE_NAME)>(args);\n'
         '}\n',
         INTERFACE_NAME=self._interface.id);
 
   def EmitHelpers(self, base_class):
     # Emit internal constructor which is necessary for Dartium bindings
     # to construct wrappers from C++.  Eventually it should go away
     # once it is possible to construct such an instance directly.
+    if not self._members_emitter:
+      return
+
     super_constructor = ''
     if base_class and base_class != 'NativeFieldWrapperClass1':
       super_constructor = ' : super.internal()'
     self._members_emitter.Emit(
         '  $CLASSNAME.internal()$SUPERCONSTRUCTOR;\n',
         CLASSNAME=self._interface_type_info.implementation_name(),
         SUPERCONSTRUCTOR=super_constructor)
 
   def _EmitConstructorInfrastructure(self,
       constructor_info, constructor_callback_cpp_name, factory_method_name,
@@ skipping 751 matching lines @@
             '    if (Dart_NativeFunction func = $CLASS_NAME::resolver(name, argumentCount))\n'
             '        return func;\n',
             CLASS_NAME=os.path.splitext(os.path.basename(path))[0])
 
 def _IsOptionalStringArgumentInInitEventMethod(interface, operation, argument):
   return (
       interface.id.endswith('Event') and
       operation.id.startswith('init') and
       argument.ext_attrs.get('Optional') == 'DefaultIsUndefined' and
       argument.type.id == 'DOMString')