[tracing] Add a perfetto consumer base class

Split the JSONConsumer into a base case and subclass so that we can
implement different consumers without needing to repeat the code that
deals with the finished semaphore and endpoint setters/getters.

This makes it possible to add a test consumer that just holds the trace
events in memory in a later CL.

This CL re-uses the existing perfetto-consumer.h file to some extent,
but it was accidentally leftover from a previous CL where we stopped
using it and switched to the JSON consumer instead.

Cq-Include-Trybots: luci.v8.try:v8_linux64_perfetto_dbg_ng
Bug: v8:8339
Change-Id: I56c305833c8937da76a8e6defbe7a52c59b25106
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1621938
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61799}
7 files changed
tree: daf6d13ed936b334c424705a0b4fbfb4d0bf7926
  1. benchmarks/
  2. build_overrides/
  3. custom_deps/
  4. docs/
  5. gni/
  6. include/
  7. infra/
  8. samples/
  9. src/
  10. test/
  11. testing/
  12. third_party/
  13. tools/
  14. .clang-format
  15. .clang-tidy
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .vpython
  22. .ycm_extra_conf.py
  23. AUTHORS
  24. BUILD.gn
  25. ChangeLog
  26. CODE_OF_CONDUCT.md
  27. codereview.settings
  28. COMMON_OWNERS
  29. DEPS
  30. ENG_REVIEW_OWNERS
  31. INFRA_OWNERS
  32. LICENSE
  33. LICENSE.fdlibm
  34. LICENSE.strongtalk
  35. LICENSE.v8
  36. LICENSE.valgrind
  37. OWNERS
  38. PRESUBMIT.py
  39. README.md
  40. WATCHLISTS
README.md

V8 JavaScript Engine

V8 is Google's open source JavaScript engine.

V8 implements ECMAScript as specified in ECMA-262.

V8 is written in C++ and is used in Google Chrome, the open source browser from Google.

V8 can run standalone, or can be embedded into any C++ application.

V8 Project page: https://v8.dev/docs

Getting the Code

Checkout depot tools, and run

    fetch v8

This will checkout V8 into the directory v8 and fetch all of its dependencies. To stay up to date, run

    git pull origin
    gclient sync

For fetching all branches, add the following into your remote configuration in .git/config:

    fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
    fetch = +refs/tags/*:refs/tags/*

Contributing

Please follow the instructions mentioned at v8.dev/docs/contribute.