Mirrors implemented via patches. 2nd try.

runtime/lib/mirrors_patch.dart

Index: runtime/lib/mirrors_patch.dart
diff --git a/runtime/lib/mirrors_patch.dart b/runtime/lib/mirrors_patch.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9b61edb652cf610a81db94e7b2053663290d46d8
--- /dev/null
+++ b/runtime/lib/mirrors_patch.dart
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+// Copyright (c) 2012, 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.
+
+/**
+ * Returns a [MirrorSystem] for the current isolate.
+ */
+patch MirrorSystem currentMirrorSystem() {
+  return _Mirrors.currentMirrorSystem();
+}
+
+/**
+ * Creates a [MirrorSystem] for the isolate which is listening on
+ * the [SendPort].
+ */
+patch Future<MirrorSystem> mirrorSystemOf(SendPort port) {
+  return _Mirrors.mirrorSystemOf(port);
+}
+
+/**
+ * Returns an [InstanceMirror] for some Dart language object.
+ *
+ * This only works if this mirror system is associated with the
+ * current running isolate.
+ */
+patch InstanceMirror reflect(Object reflectee) {
+  return _Mirrors.reflect(reflectee);
+}