uint32 sequence_gap = ack_frame_.largest_observed - sequence_number;
stats_->max_sequence_reordering =
max(stats_->max_sequence_reordering, sequence_gap);
uint32 sequence_gap = ack_frame_.largest_observed - sequence_number;
stats_->max_sequence_reordering =
max(stats_->max_sequence_reordering, sequence_gap);