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This relands commit 6f9dd378.

> Merge views_mus_unittests and views_unittests
>
> - Allow testing DesktopNativeWidgetAura on Chrome OS by doing necessary
>   Mus setup.
> - To accommodate Chrome OS, tests must specify that they will be testing
>   desktop widgets before SetUp (for tests that inherit from
>   ViewsTestBase). On Chrome OS, these are the tests that provide Mus
>   coverage.
> - Command line flags are ignored, so views_unittests will perform the
>   same tests with and without --enable-features=SingleProcessMash
> - Enable some test suites on Chrome OS, such as
>   desktop_native_widget_aura_unittest.cc, and some individual tests.

TBR=tsepez@chromium.org

Bug: 911784
Change-Id: If7dd151d6ae5a47887ae0436f340a0c0372e990c
Reviewed-on: https://chromium-review.googlesource.com/c/1393454Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622549}