GitLab

[ScopedTaskEnvironment] Introduce the TimeSource trait to replace MOCK_TIME MainThreadTypes and NowSource

The impl now only relies on the new trait (after a conversion from
the TimeSourceForTraits() helper).

Only basic test were added as the current tests cover the old modes
and TimeSourceForTraits(). Tests will be cleaned up after the
migration (which will reduce the number of parametrized test
instantiation :)).

Users of the old traits will be mass-migrated in a follow-up
scripted change.

R=alexclarke@chromium.org, fdoray@chromium.org

Bug: 946657
Change-Id: Ice18fe1e170a519fc40873783ad4ef18665e268d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1689400
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676390}