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Made in service of dark mode, but also setting one for light mode after
consulting with UX.

Bug: 918194
Change-Id: Ie4a5c76cd8ba833d5e518a65fea1ff21d0f8b28d
Reviewed-on: https://chromium-review.googlesource.com/c/1393022Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619520}