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

runtime/bin/stdio_patch.dart

Index: runtime/bin/stdio_patch.dart
diff --git a/runtime/bin/stdio_patch.dart b/runtime/bin/stdio_patch.dart
index 5dd5d87c2a8e4c1111c911a078f41ea4e65cc371..9ec2d52906982903fb63bf9ccbf3a6bdf84ff635 100644
--- a/runtime/bin/stdio_patch.dart
+++ b/runtime/bin/stdio_patch.dart
@@ -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.
 
@@ -35,7 +35,13 @@ patch class _StdIOUtils {
         throw new FileIOException("Unsupported stdin type");
     }
   }
+
+  static int _socketType(Socket socket) {
+    return _getSocketType(socket);
+  }
 }
 
+
 _getStdioHandle(Socket socket, int num) native "Socket_GetStdioHandle";
-_getStdioHandleType(int num) native "File_GetStdioHandleType";
+_getStdioHandleType(int num) native "File_GetStdioHandleType";
+_getSocketType(Socket socket) native "Socket_GetType";