Add output_type_test

tests/compiler/dart2js/data/deferred_lib.dart

Index: tests/compiler/dart2js/data/deferred_lib.dart
diff --git a/tests/compiler/dart2js/data/deferred_lib.dart b/tests/compiler/dart2js/data/deferred_lib.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7a88c957edf308cbad39aedf8374890789347775
--- /dev/null
+++ b/tests/compiler/dart2js/data/deferred_lib.dart
@@ -0,0 +1,7 @@
+// Copyright (c) 2017, 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.
+
+class Class {
+  method() => 'Class.method';
+}