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While not as common of a pattern as storing base::Time in Prefs, it
does show up in a few places, and is the logical continuation of the
Set/GetTime() methods that we currently have.

Change-Id: Ib38c2f4b431733bc4f40323756ea5fc6f68dfbed
Reviewed-on: https://chromium-review.googlesource.com/1103147
Commit-Queue: Sky Malice <skym@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568089}