Add GetBoundAddress to PPB_UDPSocket_Private

ppapi/proxy/ppb_udp_socket_private_proxy.cc

Index: ppapi/proxy/ppb_udp_socket_private_proxy.cc
diff --git a/ppapi/proxy/ppb_udp_socket_private_proxy.cc b/ppapi/proxy/ppb_udp_socket_private_proxy.cc
index 071603353d2fd23ba351f407cbf9ecbec5d0c00b..8e9fd01e773ff83e5efaacd45b9a3b239eeadfb0 100644
--- a/ppapi/proxy/ppb_udp_socket_private_proxy.cc
+++ b/ppapi/proxy/ppb_udp_socket_private_proxy.cc
@@ -125,7 +125,8 @@ bool PPB_UDPSocket_Private_Proxy::OnMessageReceived(const IPC::Message& msg) {
 void PPB_UDPSocket_Private_Proxy::OnMsgBindACK(
     uint32 /* plugin_dispatcher_id */,
     uint32 socket_id,
-    bool succeeded) {
+    bool succeeded,
+    uint32 bound_port) {
   if (!g_id_to_socket) {
     NOTREACHED();
     return;
@@ -133,7 +134,7 @@ void PPB_UDPSocket_Private_Proxy::OnMsgBindACK(
   IDToSocketMap::iterator iter = g_id_to_socket->find(socket_id);
   if (iter == g_id_to_socket->end())
     return;
-  iter->second->OnBindCompleted(succeeded);
+  iter->second->OnBindCompleted(succeeded, bound_port);
 }
 
 void PPB_UDPSocket_Private_Proxy::OnMsgRecvFromACK(