Add ElementCodegenWorldBuilder

tests/compiler/dart2js/type_representation_test.dart

 // Copyright (c) 2013, 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.
 
 library type_representation_test;
 
 import 'package:expect/expect.dart';
 import "package:async_helper/async_helper.dart";
 import 'type_test_helper.dart';
 import 'package:compiler/src/elements/resolution_types.dart';
@@ skipping 31 matching lines @@
       m7(int a, String b, [List<int> c, d]) {}
       m8(int a, {String b}) {}
       m9(int a, String b, {List<int> c, d}) {}
       m10(void f(int a, [b])) {}
       """).then((env) {
         var closedWorldRefiner = env.compiler.closeResolution();
         var closedWorld = closedWorldRefiner.closedWorld;
         env.compiler.enqueuer.createCodegenEnqueuer(closedWorld);
         env.compiler.backend.onCodegenStart(
             closedWorld,
-            new CodegenWorldBuilderImpl(
+            new ElementCodegenWorldBuilderImpl(
+                env.compiler.elementEnvironment,
                 env.compiler.backend.nativeBasicData,
                 closedWorld,
                 env.compiler.backend.constants,
                 const TypeMaskStrategy()));
         TypeRepresentationGenerator typeRepresentation =
             new TypeRepresentationGenerator(env.compiler.backend.namer);
 
         Expression onVariable(ResolutionTypeVariableType variable) {
           return new VariableUse(variable.name);
         }
@@ skipping 214 matching lines @@
             ' $named: {c: [$List_rep, $int_rep], d: null}}');
 
         // m10(void f(int a, [b])) {}
         expect(
             env.getElement('m10').computeType(env.compiler.resolution),
             '{$func: 1, $args:'
             ' [{$func: 1,'
             ' $retvoid: true, $args: [$int_rep], $opt: [,]}]}');
       }));
 }