Reset the BWE when the network changes

webrtc/p2p/base/candidate.h

Index: webrtc/p2p/base/candidate.h
diff --git a/webrtc/p2p/base/candidate.h b/webrtc/p2p/base/candidate.h
index 11481cdb05a972db4237d3ef961cea6b0bc7e066..c8ecb8233acea43ed14a3f6bde81edf8e2ea4d28 100644
--- a/webrtc/p2p/base/candidate.h
+++ b/webrtc/p2p/base/candidate.h
@@ -149,6 +149,10 @@ class Candidate {
   }
   uint32_t network_cost() const { return network_cost_; }
 
+  // An ID assigned to the network hosting the candidate.
+  uint16_t network_id() const { return network_id_; }
+  void set_network_id(uint16_t network_id) { network_id_ = network_id; }
+
   const std::string& foundation() const {
     return foundation_;
   }
@@ -253,11 +257,12 @@ class Candidate {
   std::string type_;
   std::string network_name_;
   rtc::AdapterType network_type_;
+  uint32_t network_cost_ = 0;
+  uint16_t network_id_ = 0;
   uint32_t generation_;
   std::string foundation_;
   rtc::SocketAddress related_address_;
   std::string tcptype_;
-  uint32_t network_cost_ = 0;
   std::string transport_name_;
 };