Preliminary checked mirrors (not ready for review yet)

pkg/checked_mirrors/test/from_sdk/library_uri_io_test.dart

Index: pkg/checked_mirrors/test/from_sdk/library_uri_io_test.dart
diff --git a/tests/lib/mirrors/library_uri_io_test.dart b/pkg/checked_mirrors/test/from_sdk/library_uri_io_test.dart
similarity index 88%
copy from tests/lib/mirrors/library_uri_io_test.dart
copy to pkg/checked_mirrors/test/from_sdk/library_uri_io_test.dart
index c44ff1bad977a9814ca82f117c3a8592f61a6986..f7f8316664d5f9f0de6aead41026b858cd9f0cf4 100644
--- a/tests/lib/mirrors/library_uri_io_test.dart
+++ b/pkg/checked_mirrors/test/from_sdk/library_uri_io_test.dart
@@ -6,9 +6,9 @@
 
 library MirrorsTest;
 
-import 'dart:mirrors';
+import 'package:checked_mirrors/checked_mirrors.dart';
 import 'dart:io';
-import '../../../pkg/unittest/lib/unittest.dart';
+import 'package:unittest/unittest.dart';
 
 class Class {
 }