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Currently, DisplaySnapshot provides an API that says whether or not
privacy-screen is supported by the display.

This CL modifies this API so that querying the prop will return the
state; whether it exists or not, and enabled/disabled if does.

Bug: b/147451539
Test: display_unittests
Change-Id: Idf4b111f0325550907eebe676f51e705eb8dad2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007871
Commit-Queue: Gil Dekel <gildekel@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#734249}