Start using the dart2js type conversions in Dartium as well.

tools/dom/scripts/generator.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 systems to generate
 Dart APIs from the IDL database."""
 
 import copy
 import json
@@ skipping 503 matching lines @@
       parameter_count = len(self.param_infos)
     return ', '.join(map(param_name, self.param_infos[:parameter_count]))
 
   def isCallback(self, type_registry, type_id):
     if type_id:
       callback_type = type_registry._database._all_interfaces[type_id]
       return callback_type.operations[0].id == 'handleEvent' if len(callback_type.operations) > 0 else False
     else:
       return False
 
-  def ParametersAsListOfVariables(self, parameter_count=None, type_registry=None, dart_js_interop=False):
+  def ParametersAsListOfVariables(self, parameter_count=None, type_registry=None, dart_js_interop=False, backend = None):
     """Returns a list of the first parameter_count parameter names
     as raw variables.
     """
     isRemoveOperation = self.name == 'removeEventListener' or self.name == 'removeListener'
 
     if parameter_count is None:
       parameter_count = len(self.param_infos)
     if not type_registry:
       return [p.name for p in self.param_infos[:parameter_count]]
     else:
@@ skipping 46 matching lines @@
               else:
                 callback_args_call.append(callback_arg.id)
             parameters.append('unwrap_jso((%s) => %s(%s))' %
                               (", ".join(callback_args_decl),
                                p.name,
                                ", ".join(callback_args_call)))
           else:
             parameters.append('unwrap_jso(%s)' % p.name)
         else:
           if dart_js_interop:
+            conversion = backend._InputConversion(p.type_id, self.declared_name)
             passParam = p.name
-            if type_id == 'Dictionary':
+            if conversion:
               # Need to pass the IDL Dictionary from Dart Map to JavaScript object.
-              passParam = '{0} != null ? new js.JsObject.jsify({0}) : {0}'.format(p.name)
+              passParam = '{0}({1})'.format(conversion.function_name, p.name)
           else:
             passParam = p.name
           parameters.append(passParam)
 
       return parameters
 
   def ParametersAsStringOfVariables(self, parameter_count=None):
     """Returns a string containing the first parameter_count parameter names
     as raw variables, comma separated.
     """
@@ skipping 849 matching lines @@
             return_type == 'Rectangle')
 
 def wrap_return_type_blink(return_type, type_name, type_registry):
     """Returns True if we should wrap the returned value. This checks
     a number of different variations, calling the more basic functions
     above."""
     return (wrap_unwrap_type_blink(return_type, type_registry) or
             wrap_unwrap_type_blink(type_name, type_registry) or
             wrap_type_blink(return_type, type_registry) or
             wrap_unwrap_list_blink(return_type, type_registry))