Add a continual_gathering_policy in PeerConnection RTCConfiguration

talk/app/webrtc/peerconnection.cc

Index: talk/app/webrtc/peerconnection.cc
diff --git a/talk/app/webrtc/peerconnection.cc b/talk/app/webrtc/peerconnection.cc
index 121565593d718c83e2f884268a59c3e090691a1a..f934b61b6fcfd50b6f234601a29e7983acb9e6fd 100644
--- a/talk/app/webrtc/peerconnection.cc
+++ b/talk/app/webrtc/peerconnection.cc
@@ -696,8 +696,7 @@ bool PeerConnection::UpdateIce(const RTCConfiguration& config) {
       }
     }
   }
-  session_->SetIceConnectionReceivingTimeout(
-      config.ice_connection_receiving_timeout);
+  session_->SetIceConfig(session_->ParseIceConfig(config));
   return session_->SetIceTransports(config.type);
 }