Preliminary checked mirrors (not ready for review yet)

pkg/checked_mirrors/test/from_sdk/unmangled_type_test.dart

Index: pkg/checked_mirrors/test/from_sdk/unmangled_type_test.dart
diff --git a/tests/lib/mirrors/unmangled_type_test.dart b/pkg/checked_mirrors/test/from_sdk/unmangled_type_test.dart
similarity index 88%
copy from tests/lib/mirrors/unmangled_type_test.dart
copy to pkg/checked_mirrors/test/from_sdk/unmangled_type_test.dart
index dbc6b62437908677c6fb6c1dab670b8d0dd7d2b6..a9b71dc24e76e3c98b64b5ff4968823d790daf5d 100644
--- a/tests/lib/mirrors/unmangled_type_test.dart
+++ b/pkg/checked_mirrors/test/from_sdk/unmangled_type_test.dart
@@ -2,7 +2,7 @@
 // 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.
 
-import 'dart:mirrors';
+import 'package:checked_mirrors/checked_mirrors.dart';
 
 import 'package:expect/expect.dart';