Add test directive to include other files used by a test in its compiled output directory.

tests/standalone/io/https_server_test.dart

Index: tests/standalone/io/https_server_test.dart
diff --git a/tests/standalone/io/https_server_test.dart b/tests/standalone/io/https_server_test.dart
index 3f9bc523914df8a975946b6891c402c10ad21299..f49ac12d2150a2ac5b356fdcda1c85635bc34ff1 100644
--- a/tests/standalone/io/https_server_test.dart
+++ b/tests/standalone/io/https_server_test.dart
@@ -1,6 +1,10 @@
 // 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.
+//
+// OtherResources=certificates/server_chain.pem
+// OtherResources=certificates/server_key.pem
+// OtherResources=certificates/trusted_certs.pem
 
 import "dart:async";
 import "dart:io";