Ping backup connection at a slower rate

talk/app/webrtc/webrtcsession.cc

Index: talk/app/webrtc/webrtcsession.cc
diff --git a/talk/app/webrtc/webrtcsession.cc b/talk/app/webrtc/webrtcsession.cc
index 33c818da9919785f37de4bd293319eda4aea2ba5..ec0456f7cb9f1f8743dabc4794f181353369f439 100644
--- a/talk/app/webrtc/webrtcsession.cc
+++ b/talk/app/webrtc/webrtcsession.cc
@@ -1244,6 +1244,8 @@ cricket::IceConfig WebRtcSession::ParseIceConfig(
     const PeerConnectionInterface::RTCConfiguration& config) const {
   cricket::IceConfig ice_config;
   ice_config.receiving_timeout_ms = config.ice_connection_receiving_timeout;
+  ice_config.backup_connection_ping_interval =
+      config.ice_backup_candidate_pair_ping_interval;
   ice_config.gather_continually = (config.continual_gathering_policy ==
                                    PeerConnectionInterface::GATHER_CONTINUALLY);
   return ice_config;