Add GetBoundAddress to PPB_UDPSocket_Private

ppapi/shared_impl/private/udp_socket_private_impl.cc

Index: ppapi/shared_impl/private/udp_socket_private_impl.cc
diff --git a/ppapi/shared_impl/private/udp_socket_private_impl.cc b/ppapi/shared_impl/private/udp_socket_private_impl.cc
index 23f125d0acf1fca4445284ef33bf72078e7cd2bf..24cb6bb8acbb849b229c602c943dd84f135e85de 100644
--- a/ppapi/shared_impl/private/udp_socket_private_impl.cc
+++ b/ppapi/shared_impl/private/udp_socket_private_impl.cc
@@ -122,7 +122,9 @@ void UDPSocketPrivateImpl::Close() {
   PostAbortIfNecessary(&sendto_callback_);
 }
 
-void UDPSocketPrivateImpl::OnBindCompleted(bool succeeded) {
+void UDPSocketPrivateImpl::OnBindCompleted(
+    bool succeeded,
+    uint32 bound_port) {
   if (!TrackedCallback::IsPending(bind_callback_)) {
     NOTREACHED();
     return;
@@ -132,7 +134,7 @@ void UDPSocketPrivateImpl::OnBindCompleted(bool succeeded) {
     bound_ = true;
 
   TrackedCallback::ClearAndRun(&bind_callback_,
-                               succeeded ? PP_OK : PP_ERROR_FAILED);
+      succeeded ? static_cast<int32_t>(bound_port) : PP_ERROR_FAILED);
 }
 
 void UDPSocketPrivateImpl::OnRecvFromCompleted(