tree ec42001f957ff0224892af1f1a898e6718adc390
parent f50ccf6e247718844b138d9c1b8c4ce723993e8d
author bnc <bnc@google.com> 1569604802 -0700
committer Copybara-Service <copybara-worker@google.com> 1569959692 -0700

Optimize QpackBlockingManager::blocking_allowed_on_stream().

Iterating through |header_blocks_| can be costly, so handle the presumably
common cases of zero and very large blocked stream limits first.  Also,
do early return as soon as |blocked_stream_count| gets too large.

gfe-relnote: n/a, change to QUIC v99-only code.  Protected by existing disabled gfe2_reloadable_flag_quic_enable_version_99.
PiperOrigin-RevId: 271596962
Change-Id: I18ecea0ae7c631c52c8cb53badbff2ff3471b2c4