Add missing flag counts for gfe2_reloadable_flag_quic_record_frontend_service_vip_mapping and gfe2_reloadable_flag_quic_stream_id_manager_handles_accounting

gfe-relnote: n/a (flag counts)
PiperOrigin-RevId: 309746973
Change-Id: I9e439c938ba4c5d2a7f6a6dfbcc6d66aa8b4b41d

quic/core/legacy_quic_stream_id_manager.cc

diff --git a/quic/core/legacy_quic_stream_id_manager.cc b/quic/core/legacy_quic_stream_id_manager.cc
index 9598aff..6120f85 100644
--- a/quic/core/legacy_quic_stream_id_manager.cc
+++ b/quic/core/legacy_quic_stream_id_manager.cc
@@ -33,7 +33,11 @@
       num_open_incoming_streams_(0),
       num_open_outgoing_streams_(0),
       handles_accounting_(
-          GetQuicReloadableFlag(quic_stream_id_manager_handles_accounting)) {}
+          GetQuicReloadableFlag(quic_stream_id_manager_handles_accounting)) {
+  if (handles_accounting_) {
+    QUIC_RELOADABLE_FLAG_COUNT(quic_stream_id_manager_handles_accounting);
+  }
+}
 
 LegacyQuicStreamIdManager::~LegacyQuicStreamIdManager() {}