Signal QPACK dynamic table usage from quic_client_interop_test.

Mark down when a dynamic table entry is referenced from a header block in
QpackEncoder and QpackProgressiveDecoder (because they have the best knowledged
of when an entry is referenced from a header block as opposed to the encoder
stream, and also whether the entry is actually used or it cannot because it is
not acked yet or is draining).  Conveniently slap Boolean to QpackHeaderTable
even though it is not set from within QpackHeaderTable, because QpackHeaderTable
lives for the entire connection, whereas QpackProgressiveDecoder is short-lived
and does not have a direct handle of QpackDecoder to send the signal.

Tested with the following command:
  blaze run :quic_client_interop_test https://quic.aiortc.org

Output before this change:
Results for quic.aiortc.org:443
VHDR
B
3

Output after this change:
Results for quic.aiortc.org:443
VHDR
B
3d

gfe-relnote: n/a, change to non-production test tool.
PiperOrigin-RevId: 280004516
Change-Id: I24dd9ed3222dcbb570e6711cb30a41365e7cd6c5
8 files changed
tree: b2302346d479da9693cb53788a178edf6fab7a8b
  1. CONTRIBUTING.md
  2. LICENSE
  3. README.md
  4. common/
  5. epoll_server/
  6. http2/
  7. quic/
  8. spdy/
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.