[Modify] Add it

To have access to the underlying TCP socket.

websocket-sharp/Net/WebSockets/HttpListenerWebSocketContext.cs

@@ -30,6 +30,7 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.IO;
+using System.Net.Sockets;
 using System.Security.Principal;
 
 namespace WebSocketSharp.Net.WebSockets
@@ -68,6 +69,12 @@ namespace WebSocketSharp.Net.WebSockets
       }
     }
 
+    internal Socket Socket {
+      get {
+        return _context.Connection.Socket;
+      }
+    }
+
     internal Stream Stream {
       get {
         return _context.Connection.Stream;