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Every tile in the custom background dialog are now have the same fade in
effect as when custom background is loaded.

Bug: 870401
Change-Id: I744a891b7afccf0e0ee76526316f13e2181593dd
Reviewed-on: https://chromium-review.googlesource.com/1182450Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585166}