Re-enable chlo buffering on the server side of Hyperloop.

Note:
This is needed to ensure that ALPN exists before the session is created.

Protected by FLAGS_gfe2_reloadable_flag_enable_chlo_buffering_for_hyperloop_server.

PiperOrigin-RevId: 702406338

quiche/quic/core/quic_buffered_packet_store.cc

diff --git a/quiche/quic/core/quic_buffered_packet_store.cc b/quiche/quic/core/quic_buffered_packet_store.cc
index 42d00ff..eaeb19d 100644
--- a/quiche/quic/core/quic_buffered_packet_store.cc
+++ b/quiche/quic/core/quic_buffered_packet_store.cc
@@ -250,6 +250,7 @@
   } else {
     ++stats_.packets_enqueued_early;
   }
+  QUIC_CODE_COUNT(quic_buffered_packet_store_enqueue_packet);
   return SUCCESS;
 }