Do not switch best connection on the controlled side too frequently

webrtc/p2p/base/p2ptransportchannel.h

Index: webrtc/p2p/base/p2ptransportchannel.h
diff --git a/webrtc/p2p/base/p2ptransportchannel.h b/webrtc/p2p/base/p2ptransportchannel.h
index ada3ecfb8bb2deeb6bc5d9120eb1647d7cd1a1da..69d52a2deb362a9f8453a6d91dda0a9a9abecc3d 100644
--- a/webrtc/p2p/base/p2ptransportchannel.h
+++ b/webrtc/p2p/base/p2ptransportchannel.h
@@ -308,11 +308,14 @@ class P2PTransportChannel : public TransportChannelImpl,
   std::set<Connection*> pinged_connections_;
   std::set<Connection*> unpinged_connections_;
 
-  Connection* best_connection_;
+  Connection* best_connection_ = nullptr;
 
   // Connection selected by the controlling agent. This should be used only
   // at controlled side when protocol type is RFC5245.
-  Connection* pending_best_connection_;
+  Connection* last_nominated_conn_ = nullptr;
+  // The connection on which the data was received most recently.
+  Connection* last_data_received_conn_ = nullptr;
+
   std::vector<RemoteCandidate> remote_candidates_;
   bool sort_dirty_;  // indicates whether another sort is needed right now
   bool had_connection_ = false;  // if connections_ has ever been nonempty