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

tests/standalone/io/https_server_test.dart

 // 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";
 import "dart:isolate";
 
 import "package:expect/expect.dart";
 
 InternetAddress HOST;
 
 String localFile(path) => Platform.script.resolve(path).toFilePath();
@@ skipping 84 matching lines @@
   });
 }
 
 void main() {
   InternetAddress.lookup("localhost").then((hosts) {
     HOST = hosts.first;
     testListenOn();
     testEarlyClientClose();
   });
 }