gfe-relnote: In QUIC, enable IETF style loss detection. Protected by
gfe2_reloadable_flag_quic_enable_ietf_loss_detection.

PiperOrigin-RevId: 268674408
Change-Id: Idb598126b44838732b3b3a3f679b3aff80bc5beb
diff --git a/quic/core/quic_constants.h b/quic/core/quic_constants.h
index cdee0f9..3dc462c 100644
--- a/quic/core/quic_constants.h
+++ b/quic/core/quic_constants.h
@@ -241,6 +241,10 @@
 // Default initial rtt used before any samples are received.
 const int kInitialRttMs = 100;
 
+// Default fraction (1/4) of an RTT the algorithm waits before determining a
+// packet is lost due to early retransmission by time based loss detection.
+static const int kDefaultLossDelayShift = 2;
+
 // Packet number of first sending packet of a connection. Please note, this
 // cannot be used as first received packet because peer can choose its starting
 // packet number.