Add a flag count for --gfe2_reloadable_flag_quic_tls_use_early_select_cert.

PiperOrigin-RevId: 345461968
Change-Id: Id9f0a7f07c259c0c31fde78a230800c0cf653574

quic/core/tls_server_handshaker.cc

diff --git a/quic/core/tls_server_handshaker.cc b/quic/core/tls_server_handshaker.cc
index 38a4638..3d0d8dc 100644
--- a/quic/core/tls_server_handshaker.cc
+++ b/quic/core/tls_server_handshaker.cc
@@ -526,6 +526,8 @@
     return ssl_select_cert_success;
   }
 
+  QUIC_RELOADABLE_FLAG_COUNT(quic_tls_use_early_select_cert);
+
   if (!pre_shared_key_.empty()) {
     // TODO(b/154162689) add PSK support to QUIC+TLS.
     QUIC_BUG << "QUIC server pre-shared keys not yet supported with TLS";