First version of Codecs and Converters.

sdk/lib/convert/convert.dart

Index: sdk/lib/convert/convert.dart
diff --git a/tests/language/duplicate_interface_lib.dart b/sdk/lib/convert/convert.dart
similarity index 59%
copy from tests/language/duplicate_interface_lib.dart
copy to sdk/lib/convert/convert.dart
index 4602bcda6152b8e7e29c5e470df0751f3bf7e0e8..c0eab66e5cdf10cbf0d1c506144c0b3d1ac6cf32 100644
--- a/tests/language/duplicate_interface_lib.dart
+++ b/sdk/lib/convert/convert.dart
@@ -1,11 +1,12 @@
 // 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.
-// Check fail because of cycles in super class relationship.
 
-library Interface_Lib;
+library dart.convert;
 
-class InterfA { }
-
-class InterfB { }
+import 'dart:json' as OLD_JSON_LIB;
+import 'dart:utf' as OLD_UTF_LIB;
 
+part 'converter.dart';
+part 'json.dart';
+part 'utf.dart';