Don't arm PTO for ApplicationData until handshake confirmed.
Protected by FLAGS_quic_reloadable_flag_quic_fix_arm_pto_for_application_data.
PiperOrigin-RevId: 332100576
Change-Id: I74ee1bea3f99eaa62d38d59d3c36ed5e53f2b03a
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.