Add thread-checking to TransportFeedbackAdapter

webrtc/modules/congestion_controller/transport_feedback_adapter.cc

Index: webrtc/modules/congestion_controller/transport_feedback_adapter.cc
diff --git a/webrtc/modules/congestion_controller/transport_feedback_adapter.cc b/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
index fa27cc0b18ff7c054bfc0656bd14b2c0d9a16d5a..cc80c67fce189b639a74ae6603a91be6b0c0a1ab 100644
--- a/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
+++ b/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
@@ -155,6 +155,7 @@ std::vector<PacketInfo> TransportFeedbackAdapter::GetPacketFeedbackVector(
 
 void TransportFeedbackAdapter::OnTransportFeedback(
     const rtcp::TransportFeedback& feedback) {
+  RTC_DCHECK(last_packet_feedback_vector_thread_checker_.CalledOnValidThread());
   last_packet_feedback_vector_ = GetPacketFeedbackVector(feedback);
   DelayBasedBwe::Result result;
   {
@@ -168,6 +169,7 @@ void TransportFeedbackAdapter::OnTransportFeedback(
 
 std::vector<PacketInfo> TransportFeedbackAdapter::GetTransportFeedbackVector()
     const {
+  RTC_DCHECK(last_packet_feedback_vector_thread_checker_.CalledOnValidThread());
   return last_packet_feedback_vector_;
 }