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This relands "Make showcase home screen not translucent.".

Original change's description:
> Make showcase home screen not translucent.
>
> EarlGrey 1.10.1 has a bug that the scrollToTop action hangs
> indefinitely if the UITableView's navigation bar is translucent. Given
> that it makes no difference whether the view is translucent or not,
> this CL makes it not translucent to unblock rolling EarlGrey to 1.10.

Bug: 747116
Change-Id: I9c3af1633aac27439734925c142f8a684eeb9658
Reviewed-on: https://chromium-review.googlesource.com/580341Reviewed-by: Ed Chin <edchin@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488718}