Add secure sockets to dart:io

runtime/bin/tls_socket_patch.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.
+
+patch class TlsSocket {
+  /* patch */ static void setCertificateDatabase(String pkcertDirectory)
+      native "TlsSocket_SetCertificateDatabase";
+}
+
+patch class _TlsFilter extends NativeFieldWrapperClass1 {
+  /* patch */ void init() native "TlsSocket_Init";
+
+  /* patch */ void connect() native "TlsSocket_Connect";
+
+  /* patch */ void registerHandshakeCallbacks(Function startHandshakeHandler,
+                                              Function finishHandshakeHandler)
+      native "TlsSocket_RegisterHandshakeCallbacks";
+  /* patch */ int processBuffer(int bufferIndex)
+      native "TlsSocket_ProcessBuffer";
+  /* patch */ void destroy() native "TlsSocket_Destroy";
+}