Remember metadata positions for mixin and function typedefs.

tests/lib/mirrors/typedef_metadata_test.dart

Index: tests/lib/mirrors/typedef_metadata_test.dart
diff --git a/tests/lib/mirrors/typedef_metadata_test.dart b/tests/lib/mirrors/typedef_metadata_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e07339ae459cc299350cee477c32c8f420c9acbe
--- /dev/null
+++ b/tests/lib/mirrors/typedef_metadata_test.dart
@@ -0,0 +1,23 @@
+// 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.
+
+@string @symbol
+library test.typedef_metadata_test;
+
+import 'dart:mirrors';
+
+import 'metadata_test.dart';
+
+class S {}
+class M {}
+@symbol
+typedef MA = S with M;
+
+@string
+typedef bool Predicate(Object o);
+
+main() {
+  checkMetadata(reflectClass(MA), [symbol]);
+  checkMetadata(reflectClass(Predicate), [string]);
+}