Add 16-bit network id to the candidate signaling.

webrtc/base/network.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 268 matching lines @@
   // Result of Network merge. Element in this list should have unique key.
   NetworkList merged_list;
   for (const auto& kv : consolidated_address_list) {
     const std::string& key = kv.first;
     Network* net = kv.second.net;
     auto existing = networks_map_.find(key);
     if (existing == networks_map_.end()) {
       // This network is new. Place it in the network map.
       merged_list.push_back(net);
       networks_map_[key] = net;
+      net->set_id(next_available_network_id_++);
       // Also, we might have accumulated IPAddresses from the first
       // step, set it here.
       net->SetIPs(kv.second.ips, true);
       *changed = true;
     } else {
       // This network exists in the map already. Reset its IP addresses.
       Network* existing_net = existing->second;
       *changed = existing_net->SetIPs(kv.second.ips, *changed);
       merged_list.push_back(existing_net);
       // If the existing network was not active, networks have changed.
@@ skipping 620 matching lines @@
   std::stringstream ss;
   // Print out the first space-terminated token of the network desc, plus
   // the IP address.
   ss << "Net[" << description_.substr(0, description_.find(' '))
      << ":" << prefix_.ToSensitiveString() << "/" << prefix_length_
      << ":" << AdapterTypeToString(type_) << "]";
   return ss.str();
 }
 
 }  // namespace rtc