Enable strict flags for all service tests

runtime/observatory/test/native_metrics_test.dart

Index: runtime/observatory/test/native_metrics_test.dart
diff --git a/runtime/observatory/test/native_metrics_test.dart b/runtime/observatory/test/native_metrics_test.dart
index 39b23d1328efc5a1072771d5bd77908b1fa44384..e62ceae870bb469d7c1fca6ffe68bd4d59e06217 100644
--- a/runtime/observatory/test/native_metrics_test.dart
+++ b/runtime/observatory/test/native_metrics_test.dart
@@ -1,3 +1,8 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file

[turnidge, 2015/03/27 17:25:18]

2015

[Cutch, 2015/03/27 23:32:00]

Done.

+// 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.
+// VMOptions=--compile-all --error_on_bad_type --error_on_bad_override --checked
+
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';