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The way this is implemented will lead to overlays being enabled on
paths where a blacklist may be applied. The variable names are
changed to make it clear that this affects all overlay support, not
just hardware ones.

R=sunnyps, zmo

Bug: 906722, 1056267
Change-Id: I25ae0e465376f1cb9d19b279b7498802021a23fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2176269Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Maggie Chen <magchen@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#765332}