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

webrtc/base/virtualsocketserver.h

Index: webrtc/base/virtualsocketserver.h
diff --git a/webrtc/base/virtualsocketserver.h b/webrtc/base/virtualsocketserver.h
index daf0145a26c489c9ce8927e2a6d19830ad6418ee..cfeb1508e5c43cf7e5395a8dcceaa3242470caf9 100644
--- a/webrtc/base/virtualsocketserver.h
+++ b/webrtc/base/virtualsocketserver.h
@@ -283,6 +283,8 @@ class VirtualSocket : public AsyncSocket, public MessageHandler {
   int EstimateMTU(uint16_t* mtu) override;
   void OnMessage(Message* pmsg) override;
 
+  int BindToNetwork(NetworkHandle net_handle) override;
+
   bool was_any() { return was_any_; }
   void set_was_any(bool was_any) { was_any_ = was_any; }