QUIC varz to track measured and predicted bandwidth and rtt histograms

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 b8a702463f9810826808fee556989bc4f3f08e5c..565797fcc9fdf1339e9bfd9de51be58e8e9593a0 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -787,6 +787,10 @@ QuicBandwidth QuicSentPacketManager::BandwidthEstimate() const {
   return send_algorithm_->BandwidthEstimate();
 }
 
+bool QuicSentPacketManager::HasReliableBandwidthEstimate() const {
+  return send_algorithm_->HasReliableBandwidthEstimate();
+}
+
 QuicByteCount QuicSentPacketManager::GetCongestionWindow() const {
   return send_algorithm_->GetCongestionWindow();
 }