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This patch adds a use counter for each value of content visibility
other than the default.

R=chrishtr@chromium.org

Fixed: 1096676
Change-Id: I71dcb549b04b249f701bcc0b5b68f966052f0c8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2257540
Commit-Queue: vmpstr <vmpstr@chromium.org>
Auto-Submit: vmpstr <vmpstr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781372}