For loss detection tuning, if user agent is available, save it into quicsession. protected by --gfe2_reloadable_flag_quic_save_user_agent_in_quic_session.
PiperOrigin-RevId: 316688269
Change-Id: I2a25beeb081b38ae204a62c14459427341efa5e0
QUICHE (QUIC, Http/2, Etc) is Google‘s implementation of QUIC and related protocols. It powers Chromium as well as Google’s QUIC servers and some other projects.