GitLab

Clicking on the same custom background image tile should be considered
as unselecting the tile. Therefore, the done button should not be
clickable after that.

Bug: 879002
Change-Id: I2396660dec1a10d2a4acd05e8d80672db8072a3c
Reviewed-on: https://chromium-review.googlesource.com/1197463
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587834}