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In tablet mode, when try to keyboard focus the in-app hotseat, it gets
focused but remains hidden.
This change:
- Force the hotseat to be extended in a similar way as when it gets
Chromevox focused.
- Hides the hotseat when it loses focus, unless it was manually
extended.

Bug: 1020308
Change-Id: Ie1f6ae1b91c9bd21e27552de42cf195dbf113b69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918642Reviewed-by: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715741}