relnote: Add a new LazyFack loss detection to QUIC triggered by the LFAK connection option.

net/quic/core/congestion_control/general_loss_algorithm.h

Index: net/quic/core/congestion_control/general_loss_algorithm.h
diff --git a/net/quic/core/congestion_control/general_loss_algorithm.h b/net/quic/core/congestion_control/general_loss_algorithm.h
index ccfa734c5735ab0684ca09cf339c95ef581f5c10..7b2a253b258b886feb247ee946d4f99eb61c0e92 100644
--- a/net/quic/core/congestion_control/general_loss_algorithm.h
+++ b/net/quic/core/congestion_control/general_loss_algorithm.h
@@ -65,6 +65,8 @@ class NET_EXPORT_PRIVATE GeneralLossAlgorithm : public LossDetectionInterface {
   // loss.  Fraction calculated by shifting max(SRTT, latest_rtt) to the right
   // by reordering_shift.
   int reordering_shift_;
+  // The largest newly acked from the previous call to DetectLosses.
+  QuicPacketNumber largest_previously_acked_;
 
   DISALLOW_COPY_AND_ASSIGN(GeneralLossAlgorithm);
 };