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* Allows reusing time-based logic for when safety check ran (e.g.
  string construction) to be reused across platforms.

Bug: 1015841
Change-Id: I6db5be39619d510f1a6c95d16767275146477c84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144090
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760007}