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See bug for specs. Focus ring was already done as part of virtual desks.
Since alt tab shares UI with overview, it is done implicitly as well.

Test: manual
Bug: 1128760, 1128757
Change-Id: I194b6e92ca8b406fea7bc05733e295f16adfc648
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446838
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Min Chen <minch@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814783}