Reland of Make it possible for tests to set up trace event handlers. (patchset #1 id:1 of https://codereview.webrtc.org/2997963002/ )

Reason for revert:
This should fix it

Original issue's description:
> Revert of Make it possible for tests to set up trace event handlers. (patchset #4 id:60001 of https://codereview.webrtc.org/3002663002/ )
>
> Reason for revert:
> Breaks Chromium bots.
> https://build.chromium.org/p/chromium.webrtc.fyi/builders/Mac%20Builder/builds/27340/steps/generate_build_files/logs/stdio
>
> Original issue's description:
> > Make it possible for tests to set up trace event handlers.
> >
> > As it is now, the first time a TRACE_EVENT... is called, the result from
> > the current handler is stored in a static const variable, and subsequent
> > calls will use that value regardless of changes to the handler.
> >
> > This is a problem if a test wants to use another handler.
> >
> > BUG=None
> >
> > Review-Url: https://codereview.webrtc.org/3002663002
> > Cr-Commit-Position: refs/heads/master@{#19382}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/a9732656221e0033ab93ecf01cf07f71817da1e8
>
> TBR=hbos@webrtc.org,kwiberg@webrtc.org,mbonadei@webrtc.org,kjellander@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=None
>
> Review-Url: https://codereview.webrtc.org/2997963002
> Cr-Commit-Position: refs/heads/master@{#19383}
> Committed: https://chromium.googlesource.com/external/webrtc/+/db758c2589a983a7dd94dfdd9272892e28251fe4

TBR=hbos@webrtc.org,kwiberg@webrtc.org,mbonadei@webrtc.org,kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.webrtc.org/2995123002
Cr-Commit-Position: refs/heads/master@{#19386}
2 files changed
tree: d76579dc9186d49358f1f2ea6bd2001f235ee4d7
  1. build_overrides/
  2. data/
  3. infra/
  4. resources/
  5. tools_webrtc/
  6. webrtc/
  7. .clang-format
  8. .git-blame-ignore-revs
  9. .gitignore
  10. .gn
  11. AUTHORS
  12. BUILD.gn
  13. check_root_dir.py
  14. cleanup_links.py
  15. CODE_OF_CONDUCT.md
  16. codereview.settings
  17. DEPS
  18. LICENSE
  19. license_template.txt
  20. LICENSE_THIRD_PARTY
  21. OWNERS
  22. PATENTS
  23. PRESUBMIT.py
  24. pylintrc
  25. README.md
  26. WATCHLISTS
README.md

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others.

Development

See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.

More info