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

tests/standalone/io/secure_socket_alpn_test.dart

Index: tests/standalone/io/secure_socket_alpn_test.dart
diff --git a/tests/standalone/io/secure_socket_alpn_test.dart b/tests/standalone/io/secure_socket_alpn_test.dart
index 8bd4e27ecd262a54b6c0253231ab2ddd1458ecae..6b835e677b30bab87777a01f2cb2cbb293d699d6 100644
--- a/tests/standalone/io/secure_socket_alpn_test.dart
+++ b/tests/standalone/io/secure_socket_alpn_test.dart
@@ -1,6 +1,10 @@
 // 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.
+//
+// OtherResources=certificates/server_chain.pem
+// OtherResources=certificates/server_key.pem
+// OtherResources=certificates/trusted_certs.pem
 
 import 'dart:io';
 import 'dart:convert';