QUIC varz to track measured and predicted bandwidth and rtt histograms

net/quic/congestion_control/fix_rate_sender.cc

Index: net/quic/congestion_control/fix_rate_sender.cc
diff --git a/net/quic/congestion_control/fix_rate_sender.cc b/net/quic/congestion_control/fix_rate_sender.cc
index 43a8d0a91181f78df523f9edbbb6b0d1631c78ba..ac5b46f50fd4c2cd4e5419a42bf0f2b2f3b21457 100644
--- a/net/quic/congestion_control/fix_rate_sender.cc
+++ b/net/quic/congestion_control/fix_rate_sender.cc
@@ -87,6 +87,9 @@ QuicBandwidth FixRateSender::BandwidthEstimate() const {
   return bitrate_;
 }
 
+bool FixRateSender::HasReliableBandwidthEstimate() const {
+  return true;
+}
 
 QuicTime::Delta FixRateSender::RetransmissionDelay() const {
   // TODO(pwestin): Calculate and return retransmission delay.