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The GWP-ASan unit tests need to use multi-process tests to tests
crashing processes and modifying global state. On Android (before Q)
running multi-process tests requires not running on the main thread, but
whether tests do/don't run on the main thread is a global property of
the entire unit test suite and setting the entirety of
components_unittests to not run on the main thread causes a multitude of
failures.

Instead, create a gwp_asan_unittests test suite just for the GWP-ASan
tests, run it everywhere components_unittests used to run, and set it to
launch tests off of the main thread.

Bug: 973167
Change-Id: I40aa9ca99ee32580a570ceda9b282eed05705eaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730770
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683625}