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The uptime is only estimate and updated when app gets backgrounded,
battery level changes or similar system notification is posted.

It might be useful to add a timer, which updates up time every few
seconds, but that change will be done in a separate CL.

Bug: 1103752
Change-Id: Ie12af0a259f915181199bd58aa1dbc57758ab60b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459307
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815350}