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Show the focus outline on a selected bg tile when navigating with the
keyboard.

http://go/scrcast/NTA2NTc0NTg1MzU3OTI2NHw1NGE3MmRmYS02Ng

Bug: 937570
Change-Id: I96c1449ddff90a5c32a2348607506ab5ae728743
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728045Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683399}