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
22 files changed
tree: 0cde4a912e203e5169edb4fe1ebb5f5ccbc4b71e
  1. common/
  2. epoll_server/
  3. http2/
  4. quic/
  5. spdy/
  6. CONTRIBUTING.md
  7. LICENSE
  8. README.md
README.md

QUICHE

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. QUICHE is only supported on little-endian platforms.

Code can be viewed in CodeSearch in Quiche and is imported into Chromium.