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This is for testing Adaptive Screen Brightness code.

Also changes the Adaptive Screen Brightness code to
use this implementation of IsVisible.

Bug: 820883
Change-Id: Ieb46e1b6cc8e9036c4e510872ee053017426943b
Reviewed-on: https://chromium-review.googlesource.com/1004837
Commit-Queue: Paul Dyson <pdyson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549969}