Add missing files from previous commit

tests/standalone/io/secure_client_server_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.
+//
+// VMOptions=
+// VMOptions=--short_socket_read
+// VMOptions=--short_socket_write
+// VMOptions=--short_socket_read --short_socket_write
+
+import "dart:async";
+import "dart:io";
+import "dart:isolate";
+
+const SERVER_ADDRESS = "127.0.0.1";
+const HOST_NAME = "localhost";
+const CERTIFICATE = "localhost_cert";
+Future<SecureServerSocket> startEchoServer() {
+  return SecureServerSocket.bind(SERVER_ADDRESS,
+                                 0,
+                                 5,
+                                 CERTIFICATE).then((server) {
+    server.listen((SecureSocket client) {
+      client.reduce(<int>[], (message, data) => message..addAll(data))
+          .then((message) {
+            client.add(message);
+            client.close();
+          });
+    });
+    return server;
+  });
+}
+
+Future testClient(server) {
+  return SecureSocket.connect(HOST_NAME, server.port).then((socket) {
+    socket.add("Hello server.".charCodes);
+    socket.close();
+    return socket.reduce(<int>[], (message, data) => message..addAll(data))
+        .then((message) {
+          Expect.listEquals("Hello server.".charCodes, message);
+          return server;
+        });
+  });
+}
+
+void main() {
+  Path scriptDir = new Path(new Options().script).directoryPath;
+  Path certificateDatabase = scriptDir.append('pkcert');
+  SecureSocket.initialize(database: certificateDatabase.toNativePath(),
+                          password: 'dartdart');
+
+  startEchoServer()
+      .then(testClient)
+      .then((server) {
+        server.close();
+      });
+}