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This particular feature is moving more slowly than the rest of the
lighting features, so we'll want to be able to toggle it separately.

Bug: 1070819
Change-Id: I94af3008e347023d342296f0a96380139855b33d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252841Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781416}