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Add support for a timestamp of when safety check last found issues.

Add support for initial unsafe states to only show if a safety check
has previously found isses.

Bug: 1078782
Change-Id: Ica710b284c066684cfad8488ada996295756ac29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421310
Commit-Queue: Sean Harrison <harrisonsean@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810513}