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Add the selected state for the default tile, using a placeholder
icon for now. Make clicking done rest the background to default.

Screencast: http://go/scrcast/NTg4MzA0MjMyMTEzNzY2NHwxYTFhMDM1YS0zNA

Bug: 937570
Change-Id: Iab0b09c16124333caf9513126ee94e7d403d15f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606577
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658841}