tree 0cde4a912e203e5169edb4fe1ebb5f5ccbc4b71e
parent 098ba77be56e68fa4d8828db6c34b99b67dc4282
author bnc <bnc@google.com> 1615600195 -0800
committer Copybara-Service <copybara-worker@google.com> 1615600225 -0800

Remove unused HPACK entry timing infrastructure.

All of this code has been added to measure head of line blocking due to using
HPACK with gQUIC.  The results of this experiment have informed the design of
different header compression algorithms.  In the end, QPACK has been chosen for
HTTP/3.  The experiment has concluded, and all of this code can be removed.

Removing a 64-bit time_added from http2::HpackDecoderTableEntry and
spdy::HpackEntry (also aliased as quic::QpackEntry) will slightly decrease
memory consumption.

Also remove HpackDecoderTablesDebugListener, QuicHpackDebugVisitor,
HpackHeaderTable::DebugVisitorInterface, their subclasses, and related
accessors.
PiperOrigin-RevId: 362635008
Change-Id: Ifed10c678a5f9ef5d7daccb019f205460d070b4a