Handle resolvedAst for forwarding constructors and callType on unnamed mixin applications.

tests/compiler/dart2js/type_test_helper.dart

Index: tests/compiler/dart2js/type_test_helper.dart
diff --git a/tests/compiler/dart2js/type_test_helper.dart b/tests/compiler/dart2js/type_test_helper.dart
index 1e20ba761f0b950cb3cdc805fdc6e2e58a0a40b5..5e91f774939c3dbf5f7c17959b033e828f552de9 100644
--- a/tests/compiler/dart2js/type_test_helper.dart
+++ b/tests/compiler/dart2js/type_test_helper.dart
@@ -8,6 +8,7 @@ import 'dart:async';
 import 'package:expect/expect.dart';
 import 'compiler_helper.dart' as mock;
 import 'memory_compiler.dart' as memory;
+import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/dart_types.dart';
 import 'package:compiler/src/compiler.dart'
@@ -31,6 +32,8 @@ GenericType instantiate(TypeDeclarationElement element,
 class TypeEnvironment {
   final Compiler compiler;
 
+  Resolution get resolution => compiler.resolution;
+
   static Future<TypeEnvironment> create(
       String source, {bool useMockCompiler: true,
                       bool expectNoErrors: false,