Preliminary checked mirrors (not ready for review yet)

pkg/checked_mirrors/test/from_sdk/intercepted_cache_test.dart

Index: pkg/checked_mirrors/test/from_sdk/intercepted_cache_test.dart
diff --git a/tests/lib/mirrors/intercepted_cache_test.dart b/pkg/checked_mirrors/test/from_sdk/intercepted_cache_test.dart
similarity index 92%
copy from tests/lib/mirrors/intercepted_cache_test.dart
copy to pkg/checked_mirrors/test/from_sdk/intercepted_cache_test.dart
index 818906d781ecefda837e97a683064e7513f86ed3..1c9d209cb07646dfd49c15056b44efe801689a2a 100644
--- a/tests/lib/mirrors/intercepted_cache_test.dart
+++ b/pkg/checked_mirrors/test/from_sdk/intercepted_cache_test.dart
@@ -6,7 +6,7 @@
 // etc. The test is using getField, as invoke, setField, and getField all share
 // the same caching.
 
-import 'dart:mirrors';
+import 'package:checked_mirrors/checked_mirrors.dart';
 
 import 'package:expect/expect.dart';