Use Quic protocol flags to control QuicStreamIdManager's max_streams_window.
This adds tunability.
gfe-relnote: no behavior change. not protected.
PiperOrigin-RevId: 305244897
Change-Id: I30e290d1acbd63919096ac577b5b13595ec63ca6
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.