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

webrtc/base/network.h

Index: webrtc/base/network.h
diff --git a/webrtc/base/network.h b/webrtc/base/network.h
index 2f2e1b3a45aaf3e3592a37374f149f63e4f4d4b2..baf9870edd82751f3eb3d4cf5ed2818bf02806dc 100644
--- a/webrtc/base/network.h
+++ b/webrtc/base/network.h
@@ -355,6 +355,9 @@ class Network {
   // Debugging description of this network
   std::string ToString() const;
 
+  NetworkHandle handle() const { return 0; }
+  bool IsHandleValid() const { return false; }

[pthatcher1, 2016/01/06 21:58:46]

Can you leave a comment about what these are how they should be used?

Also, would it make sense to return an Optional<NetworkHandle>?  It seems weird
to have two methods for basically the same thing.


Actually, the more I think about it, the more I think we can avoid even having
this.  See more comments later.

[honghaiz3, 2016/01/12 20:36:42]

Acknowledged.

+
  private:
   const DefaultLocalAddressProvider* default_local_address_provider_ = nullptr;
   std::string name_;