Enable strict flags for all service tests

runtime/observatory/test/isolate_lifecycle_test.dart

Index: runtime/observatory/test/isolate_lifecycle_test.dart
diff --git a/runtime/observatory/test/isolate_lifecycle_test.dart b/runtime/observatory/test/isolate_lifecycle_test.dart
index b74b5b73161db2870dcf8022f1f0732d28dfe5b4..654e94c4be2d34c277da28ddb91046504082873f 100644
--- a/runtime/observatory/test/isolate_lifecycle_test.dart
+++ b/runtime/observatory/test/isolate_lifecycle_test.dart
@@ -1,6 +1,7 @@
 // Copyright (c) 2015, 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.
+// VMOptions=--compile-all --error_on_bad_type --error_on_bad_override --checked
 
 import 'dart:async';
 import 'dart:isolate' as I;