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This is done to clearly separate the public interface of OverlayManager
from its internal implementation files.  Setting the "public" gn
variable for the target ensures that files that depend on overlays are
only allowed to include those files.

Bug: 941745
Change-Id: Ie9f905a857bd268c535804b3243321b6721d7c2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1562719
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653409}