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

tests/standalone/io/secure_server_client_certificate_test.dart

 // Copyright (c) 2013, 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
+// OtherResources=certificates/client_authority.pem
+// OtherResources=certificates/client1.pem
+// OtherResources=certificates/client1_key.pem
+// OtherResources=certificates/server_chain.p12
+// OtherResources=certificates/server_key.p12
+// OtherResources=certificates/trusted_certs.p12
+// OtherResources=certificates/client_authority.p12
+// OtherResources=certificates/client1.p12
+// OtherResources=certificates/client1_key.p12
+
 import "dart:async";
 import "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
 InternetAddress HOST;
 
 String localFile(path) => Platform.script.resolve(path).toFilePath();
 
@@ skipping 79 matching lines @@
   await testClientCertificate(
       required: false, sendCert: true, certType: 'p12', password: 'dartdart');
   await testClientCertificate(
       required: true, sendCert: true, certType: 'p12', password: 'dartdart');
   await testClientCertificate(
       required: false, sendCert: false, certType: 'p12', password: 'dartdart');
   await testClientCertificate(
       required: true, sendCert: false, certType: 'p12', password: 'dartdart');
   asyncEnd();
 }