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

tests/standalone/io/https_unauthorized_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
 
 // This test verifies that secure connections that fail due to
 // unauthenticated certificates throw exceptions in HttpClient.
 
 import "package:expect/expect.dart";
 import "package:path/path.dart";
 import "dart:async";
 import "dart:io";
 
 const HOST_NAME = "localhost";
@@ skipping 38 matching lines @@
       }
     });
   }
 
   runServer().then((server) {
     clientProcess(server.port).then((_) {
       server.close();
     });
   });
 }