Add function for finding what a InputStream or OutputStream is attached to

runtime/bin/io_natives.cc

Index: runtime/bin/io_natives.cc
diff --git a/runtime/bin/io_natives.cc b/runtime/bin/io_natives.cc
index a9edf88f37d3e3ed3a4bb9edc63dec2ddb2c9ce5..9c647a3490a73cffd11122866de7214584b87590 100644
--- a/runtime/bin/io_natives.cc
+++ b/runtime/bin/io_natives.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -42,6 +42,7 @@
   V(Socket_GetError, 1)                                                        \
   V(Socket_GetStdioHandle, 2)                                                  \
   V(Socket_NewServicePort, 0)                                                  \
+  V(Socket_GetType, 1)                                                         \
   V(SecureSocket_Connect, 8)                                                   \
   V(SecureSocket_Destroy, 1)                                                   \
   V(SecureSocket_Handshake, 1)                                                 \