tree e084024ec99377b4ab4922ed9c7975ac1bf04dd7
parent ef1d67557469544b51012f514fedbf862f7981b7
author haoyuewang <haoyuewang@google.com> 1591978982 -0700
committer Copybara-Service <copybara-worker@google.com> 1591979017 -0700

Add minimal spdy priority set by gws response header for initial cwnd bootstrapping for http2. also store spdy priority within spdydispatcher::sessiondata. no production behavior change unless we start an additional gws experiment. protected by gfe2_restart_flag_h2_adjust_initial_cwnd_by_gws.

While QUIC stores SPDY within spdy::PriorityWriteScheduler<...>, SPDY priority is stored in a map from stream_id to SessionData owned by SpdyClientDispatcher in this change because
(1) H2 uses LIFOWriteScheduler<...> by default, which ignores precedence (http://shortn/_2Ny3X9xBh6).
(2) We only need CWND bootstrapping for traffic from client, and hence only SpdyClientDispatcher populates the SPDY priority.

PiperOrigin-RevId: 316117083
Change-Id: I232e421b16edecc5f7146ce4fb36592a71a7e86f