Start using the dart2js type conversions in Dartium as well.

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 1177 matching lines @@
     """
     Arguments:
       info: An OperationInfo object.
     """
     return_type = self.SecureOutputType(info.type_name, False, False if dart_js_interop else True)
 
     formals = info.ParametersAsDeclaration(self._DartType)
 
     parameters = info.ParametersAsListOfVariables(None,
                                                   self._type_registry if self._dart_use_blink else None,
-                                                  dart_js_interop)
+                                                  dart_js_interop,
+                                                  self)
     dart_declaration = '%s%s %s(%s)' % (
         'static ' if info.IsStatic() else '',
         return_type,
         html_name,
         formals)
 
     operation = info.operations[0]
 
     is_custom = _IsCustom(operation)
     has_optional_arguments = any(IsOptional(argument) for argument in operation.arguments)
@@ skipping 42 matching lines @@
     else:
       self._GenerateDispatcher(info, info.operations, dart_declaration, html_name)
 
   def _GenerateDispatcher(self, info, operations, dart_declaration, html_name):
 
     def GenerateCall(
         stmts_emitter, call_emitter, version, operation, argument_count):
       native_suffix = 'Callback'
       actuals = info.ParametersAsListOfVariables(argument_count,
                                                  self._type_registry if self._dart_use_blink else None,
-                                                 self._dart_js_interop)
+                                                 self._dart_js_interop,
+                                                 self)
       actuals_s = ", ".join(actuals)
       formals=actuals
       return_type = self.SecureOutputType(operation.type.id)
 
       return_wrap_jso = False
       if self._dart_use_blink:
           return_wrap_jso = wrap_return_type_blink(return_type, info.type_name, self._type_registry)
 
       native_suffix = 'Callback'
       is_custom = _IsCustom(operation)
@@ skipping 760 matching lines @@
 
 def _IsCustom(op_or_attr):
   assert(isinstance(op_or_attr, IDLMember))
   return 'Custom' in op_or_attr.ext_attrs or 'DartCustom' in op_or_attr.ext_attrs
 
 def _IsCustomValue(op_or_attr, value):
   if _IsCustom(op_or_attr):
     return op_or_attr.ext_attrs.get('Custom') == value \
            or op_or_attr.ext_attrs.get('DartCustom') == value
   return False