Wire in the ack exponent trransport config for IETF QUIC

gfe-relnote: N/A, for IETF QUIC Only, protected by V99 flag.
PiperOrigin-RevId: 260736433
Change-Id: I5468bc4f052d78d2bf6890cdf0734cece5b107c0
diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index a13c506..e65492f 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -425,6 +425,9 @@
     stateless_reset_token_received_ = true;
     received_stateless_reset_token_ = config.ReceivedStatelessResetToken();
   }
+  if (config.HasReceivedAckDelayExponent()) {
+    framer_.set_peer_ack_delay_exponent(config.ReceivedAckDelayExponent());
+  }
   if (GetQuicReloadableFlag(quic_send_timestamps) &&
       config.HasClientSentConnectionOption(kSTMP, perspective_)) {
     QUIC_RELOADABLE_FLAG_COUNT(quic_send_timestamps);