Record the following STARTUP stats in QUIC BBRv2: - slowstart_packets_sent - slowstart_packets_lost - slowstart_bytes_sent - slowstart_bytes_lost - slowstart_num_rtts
Record the following STARTUP stats in QUIC BBRv2:
- slowstart_packets_sent
- slowstart_packets_lost
- slowstart_bytes_sent
- slowstart_bytes_lost
- slowstart_num_rtts

PiperOrigin-RevId: 366319931
Change-Id: I9031da390bd5efc44f1d8afc45be76564a08c205

google/quiche,google/quiche,google/quiche,google/quiche