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Based on crbug.com/166153, the base::TickClock still advances on Win and
Mac even when the device is suspended.

However, the WallClockTimer's doc claims that the TickClock always stop
during power suspension which is updated here.

We also add unit tests to make sure the WallClockTimer is able to cover
this case.

Bug: 1112516
Change-Id: I866a55c9b23c9460716fa6796c33fce5b62150cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333041
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795027}