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Evan Shrubsole db50b03553 Add perfetto build config 
This adds Perfetto support to WebRTC with a GN flag rtc_use_perfetto.
The configuration of perfetto depends on whether or not webrtc is
build within Chrome or not. When in Chrome, WebRTC will depend on
//third_party/perfetto:libperfetto. When building standalone, specific includes required for Perfetto are exposed with the library webrtc_libperfetto.

The perfetto trace API is exposed with a header export in
trace_event.h which is used instead of the legacy API.

The addition of Perfetto means there are 4 compilation modes for
tracing in WebRTC,
1. No tracing implementation.
2. Legacy tracing (AddTraceEvent/GetCategoryEnabled).
3.a. Perfetto statically linked (webrtc_libperfetto).
3.b. Perfetto in Chrome (Chrome's libperfetto).

This CL removes the tracing expectations from
rtc_stats_integrationtest.cc because those directly used the old API.

Integration into Chrome is a follow up CL which depends on
https://chromium-review.googlesource.com/c/chromium/src/+/5471691.

Tested: Ran Chrome with Perfetto and traces appear. WebRTC Unit test tracing working: https://ui.perfetto.dev/#!?s=04ea2613ea36b814394639a1ec4b60be5b5097527f1a485995ecc13469885468
Bug: webrtc:15917
Change-Id: I537d79dc247c2b759689910c621087286a4d8fdc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/347880
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Auto-Submit: Evan Shrubsole <eshr@google.com>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/main@{#42166}
2024-04-24 20:53:23 +00:00
..
docs Revert rtc_dcheck_always_on. 2021-07-30 13:47:50 +00:00
mb Migrate mb script to python3. 2022-08-17 13:50:43 +00:00
mb.bat tools_webrtc dir converted to py3 + top level PRESUBMIT script 2022-02-08 14:42:26 +00:00
mb.py Remove global gtest_parallel timeout. 2022-12-19 13:08:42 +00:00
mb_config.pyl Add perfetto build config 2024-04-24 20:53:23 +00:00
mb_unittest.py Remove global gtest_parallel timeout. 2022-12-19 13:08:42 +00:00
OWNERS Purge phoglund from most OWNERS files. 2020-03-09 14:08:30 +00:00
PRESUBMIT.py Add mb.py to pylint check of the root PRESUBMIT.py. 2022-03-31 10:24:02 +00:00
README.md

README.md

MB - The Meta-Build wrapper

MB is a simple wrapper intended to provide a uniform interface to either GYP or GN, such that users and bots can call one script and not need to worry about whether a given bot is meant to use GN or GYP.

It supports two main functions:

  1. "gen" - the main gyp_chromium / gn gen invocation that generates the Ninja files needed for the build.

  2. "analyze" - the step that takes a list of modified files and a list of desired targets and reports which targets will need to be rebuilt.

We also use MB as a forcing function to collect all of the different build configurations that we actually support for Chromium builds into one place, in //tools/mb/mb_config.pyl.

For more information, see: