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This is a reland of 0b107635

Includes changes to fix MSAN issues

Bug: 898712, 899158

Original change's description:
> Makes wallpaper dim in tablet mode, without relying on app_list_shield
>
> Bug: 898712
> Change-Id: I96ba08fec3f7df8547d753ff4d31366345be0ac8
> Reviewed-on: https://chromium-review.googlesource.com/c/1298507
> Reviewed-by: Weidong Guo <weidongg@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Kevin Strohbehn <ginko@google.com>
> Cr-Commit-Position: refs/heads/master@{#602938}

Bug: 898712
Change-Id: Ief534b6dc58b5d36b3f96952141a51312c50a79f
Reviewed-on: https://chromium-review.googlesource.com/c/1303233
Commit-Queue: Kevin Strohbehn <ginko@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603605}