Bind a socket to a network if the network handle is set.

webrtc/p2p/base/basicpacketsocketfactory.h

Index: webrtc/p2p/base/basicpacketsocketfactory.h
diff --git a/webrtc/p2p/base/basicpacketsocketfactory.h b/webrtc/p2p/base/basicpacketsocketfactory.h
index 5046e0f518d23b38d746343d5c8e3457c7ecfdf4..a4e2f185ae580f1b22ae1deb007f5e356cf5c893 100644
--- a/webrtc/p2p/base/basicpacketsocketfactory.h
+++ b/webrtc/p2p/base/basicpacketsocketfactory.h
@@ -16,6 +16,7 @@
 namespace rtc {
 
 class AsyncSocket;
+class Network;
 class SocketFactory;
 class Thread;
 
@@ -29,6 +30,11 @@ class BasicPacketSocketFactory : public PacketSocketFactory {
   AsyncPacketSocket* CreateUdpSocket(const SocketAddress& local_address,
                                      uint16_t min_port,
                                      uint16_t max_port) override;
+  AsyncPacketSocket* CreateUdpSocketOnNetwork(
+      const SocketAddress& local_address,
+      uint16_t min_port,
+      uint16_t max_port,
+      const Network* network) override;
   AsyncPacketSocket* CreateServerTcpSocket(const SocketAddress& local_address,
                                            uint16_t min_port,
                                            uint16_t max_port,