QUIC varz to track measured and predicted bandwidth and rtt histograms

net/quic/congestion_control/pacing_sender.cc

Index: net/quic/congestion_control/pacing_sender.cc
diff --git a/net/quic/congestion_control/pacing_sender.cc b/net/quic/congestion_control/pacing_sender.cc
index 7115571ac946bb925dc308babbe322d232b1c678..2eef952c8227d00b9c7236c0bb56eafd52dc7fa7 100644
--- a/net/quic/congestion_control/pacing_sender.cc
+++ b/net/quic/congestion_control/pacing_sender.cc
@@ -131,6 +131,10 @@ QuicBandwidth PacingSender::BandwidthEstimate() const {
   return sender_->BandwidthEstimate();
 }
 
+bool PacingSender::HasReliableBandwidthEstimate() const {
+  return sender_->HasReliableBandwidthEstimate();
+}
+
 QuicTime::Delta PacingSender::RetransmissionDelay() const {
   return sender_->RetransmissionDelay();
 }