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In a few caes, fading out a view would not actually cause it to become
invisible. These can be listed as:
 - In some cases, FadeInOutMode::kHide would not hide the view
 - If the layout were reset during a fade-out of a view hidden by
   calling SetVisible() or FadeOut() the view might fail to hide

This change ensures that a view that is supposed to fade out always does
- and adds appropriate unit tests.

Change-Id: I9713f9806e0aa13ad8b35982ac47c2112c91d348
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979635Reviewed-by: Caroline Rising <corising@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727068}