initial_rtt_us_    76 net/quic/congestion_control/rtt_stats.cc     return QuicTime::Delta::FromMicroseconds(initial_rtt_us_);
initial_rtt_us_    33 net/quic/congestion_control/rtt_stats.h     initial_rtt_us_ = initial_rtt_us;
initial_rtt_us_    56 net/quic/congestion_control/rtt_stats.h   int64 initial_rtt_us_;