When talking >=QUIC_VERSION_22, regularly send updated bandwidth

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index 089b301d8b60c5cd1072b1bb22aa43a99972c00b..171f6e2eac353ad0743d9a30a0fd518eaf1a54cf 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -190,6 +190,14 @@ void QuicSentPacketManager::OnIncomingAck(const QuicAckFrame& ack_frame,
   InvokeLossDetection(ack_receive_time);
   MaybeInvokeCongestionEvent(largest_observed_acked, bytes_in_flight);
 
+  sustained_bandwidth_recorder_.RecordEstimate(
+      send_algorithm_->InRecovery(),
+      send_algorithm_->InSlowStart(),
+      send_algorithm_->BandwidthEstimate(),
+      ack_receive_time,
+      clock_->WallNow(),
+      rtt_stats_.SmoothedRtt());
+
   // If we have received a truncated ack, then we need to clear out some
   // previous transmissions to allow the peer to actually ACK new packets.
   if (ack_frame.is_truncated) {
@@ -851,6 +859,11 @@ bool QuicSentPacketManager::HasReliableBandwidthEstimate() const {
   return send_algorithm_->HasReliableBandwidthEstimate();
 }
 
+const QuicSustainedBandwidthRecorder&
+QuicSentPacketManager::SustainedBandwidthRecorder() const {
+  return sustained_bandwidth_recorder_;
+}
+
 QuicByteCount QuicSentPacketManager::GetCongestionWindow() const {
   return send_algorithm_->GetCongestionWindow();
 }