tree b69d6f68c7d64c596ede05da8f022ca196e37ebc
parent bde76c39d428cfc284f9813e831260554836e139
author fayang <fayang@google.com> 1587669035 -0700
committer Copybara-Service <copybara-worker@google.com> 1587669221 -0700

gfe-relnote: In QUIC, add exponential backoff for PTO timeout when there is not RTT measurement. Protected by gfe2_reloadable_flag_quic_enable_version_draft_25_v3 and gfe2_reloadable_flag_quic_enable_version_draft_27.

Also change PTO timeout from 2 * initial_rtt to 3 * initial_rtt.

PiperOrigin-RevId: 308102591
Change-Id: If44e9e7f6107b7a95650e5f4744ea847d2b998d2