Set the start bitrate to the delay-based BWE.

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 f8da97ae75140933bf8a1cbf1a07c78e9b6ae9a1..b9440ac959ad2999374a4fbd29e29f6d43efb203 100644
--- a/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
+++ b/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
@@ -74,6 +74,11 @@ void TransportFeedbackAdapter::OnSentPacket(uint16_t sequence_number,
   send_time_history_.OnSentPacket(sequence_number, send_time_ms);
 }
 
+void TransportFeedbackAdapter::SetStartBitrate(int start_bitrate_bps) {
+  rtc::CritScope cs(&bwe_lock_);
+  delay_based_bwe_->SetStartBitrate(start_bitrate_bps);
+}
+
 void TransportFeedbackAdapter::SetMinBitrate(int min_bitrate_bps) {
   rtc::CritScope cs(&bwe_lock_);
   delay_based_bwe_->SetMinBitrate(min_bitrate_bps);