Update libjingle to 53057474.

R=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2274004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4818 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/base/socket.h b/talk/base/socket.h
index 9932cda..e738060 100644
--- a/talk/base/socket.h
+++ b/talk/base/socket.h
@@ -184,7 +184,8 @@
     OPT_RCVBUF,      // receive buffer size
     OPT_SNDBUF,      // send buffer size
     OPT_NODELAY,     // whether Nagle algorithm is enabled
-    OPT_IPV6_V6ONLY  // Whether the socket is IPv6 only.
+    OPT_IPV6_V6ONLY, // Whether the socket is IPv6 only.
+    OPT_DSCP         // DSCP code
   };
   virtual int GetOption(Option opt, int* value) = 0;
   virtual int SetOption(Option opt, int value) = 0;