Plumb error code from HpackDecoder to HpackDecoderAdapter, add two error codes that are detected in HpackDecoderAdapter.
gfe-relnote: n/a (no functional change)
PiperOrigin-RevId: 293813721
Change-Id: I3ea4a72daab3e676a131ff8c05e18fa3d0b86d6e
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.