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This better reflects what the code actually does as
there's now a bunch of non backgrounds related stuff
in there.

This will be followed up with renaming of the
customBackgrounds object.

Bug: None
Change-Id: I42a2f5b0eb0d5aec04ce302217f1fbf61fe57110
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1639180
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665622}