Add flag counter for FLAGS_quic_reloadable_flag_quic_bbr_bandwidth_resumption

net/quic/core/congestion_control/bbr_sender.cc

Index: net/quic/core/congestion_control/bbr_sender.cc
diff --git a/net/quic/core/congestion_control/bbr_sender.cc b/net/quic/core/congestion_control/bbr_sender.cc
index c6e89c9df9f87ad91c1fea1767c2e11f420c9f28..5220d3a94e31e49d701cb4a3a8bb9c02e13578b2 100644
--- a/net/quic/core/congestion_control/bbr_sender.cc
+++ b/net/quic/core/congestion_control/bbr_sender.cc
@@ -216,6 +216,8 @@ void BbrSender::ResumeConnectionState(
     return;
   }
 
+  QUIC_FLAG_COUNT(quic_reloadable_flag_quic_bbr_bandwidth_resumption);
+
   QuicBandwidth bandwidth = QuicBandwidth::FromBytesPerSecond(
       max_bandwidth_resumption
           ? cached_network_params.max_bandwidth_estimate_bytes_per_second()