relnote: Protected by --quic_fix_cubic_bytes_quantization. Fix CubicBytes Quantization.

net/quic/core/congestion_control/tcp_cubic_sender_bytes.cc

Index: net/quic/core/congestion_control/tcp_cubic_sender_bytes.cc
diff --git a/net/quic/core/congestion_control/tcp_cubic_sender_bytes.cc b/net/quic/core/congestion_control/tcp_cubic_sender_bytes.cc
index dab758aa8460f7f045b6e6581033716dce32d568..ce656036bb5a237631acf8207830cc6257ebbbf9 100644
--- a/net/quic/core/congestion_control/tcp_cubic_sender_bytes.cc
+++ b/net/quic/core/congestion_control/tcp_cubic_sender_bytes.cc
@@ -52,6 +52,11 @@ void TcpCubicSenderBytes::SetFromConfig(const QuicConfig& config,
       ContainsQuicTag(config.ReceivedConnectionOptions(), kCCVX)) {
     cubic_.SetFixConvexMode(true);
   }
+  if (FLAGS_quic_fix_cubic_bytes_quantization &&
+      config.HasReceivedConnectionOptions() &&
+      ContainsQuicTag(config.ReceivedConnectionOptions(), kCBQT)) {
+    cubic_.SetFixCubicQuantization(true);
+  }
 }
 
 void TcpCubicSenderBytes::SetCongestionWindowFromBandwidthAndRtt(