tree 82c1d88c3d87569bc629bc1a539785d3486183cc
parent 3a76c89e5f32c8cbece5fe8775ce7cae857be232
author bnc <bnc@google.com> 1563389710 -0700
committer Copybara-Service <copybara-worker@google.com> 1563389748 -0700

Add http3_constants.h for HTTP/3 and QPACK unidirectional stream types and settings identifiers.

In the future, HTTP/3-specific constants from quic/core/*.h can be moved here,
and HTTP/3 and QPACK-specific error codes might also live here.

Also update unused kSettingsNumPlaceholders value from 8 to 9 according to
https://quicwg.org/base-drafts/draft-ietf-quic-http.html#settings-parameters.

Also add unused QPACK settings identifiers.

gfe-relnote: n/a, QUIC v99-only change.
PiperOrigin-RevId: 258613141
Change-Id: I48cf9d6468ae99018dbe49b74c9740b8e48a287d