Try to fix flakiness of test standalone/io/raw_secure_server_socket_test

sdk/lib/io/secure_socket.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.
 
 part of dart.io;
 
 /**
  * A high-level class for communicating securely over a TCP socket, using
  * TLS and SSL. The [SecureSocket] exposes both a [Stream] and an
  * [IOSink] interface, making it ideal for using together with
@@ skipping 329 matching lines @@
     if (onBadCertificate != null) {
       _secureFilter.registerBadCertificateCallback(onBadCertificate);
     }
     var futureSocket;
     if (socket == null) {
       futureSocket = RawSocket.connect(host, requestedPort);
     } else {
       futureSocket = new Future.value(socket);
     }
     futureSocket.then((rawSocket) {
-      rawSocket.writeEventsEnabled = false;
       _socket = rawSocket;
+      _socket.readEventsEnabled = true;
+      _socket.writeEventsEnabled = false;
       if (_socketSubscription == null) {
         // If a current subscription is provided use this otherwise
         // create a new one.
         _socketSubscription = _socket.listen(_eventDispatcher,
                                              onError: _errorHandler,
                                              onDone: _doneHandler);
       } else {
         _socketSubscription.onData(_eventDispatcher);
         _socketSubscription.onError(_errorHandler);
         _socketSubscription.onDone(_doneHandler);
@@ skipping 503 matching lines @@
   void destroy();
   void handshake();
   void init();
   X509Certificate get peerCertificate;
   int processBuffer(int bufferIndex);
   void registerBadCertificateCallback(Function callback);
   void registerHandshakeCompleteCallback(Function handshakeCompleteHandler);
 
   List<_ExternalBuffer> get buffers;
 }