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When device is suspened during the session, session length limit should
apply correctly. The new test simulates suspend and resume and verifies
that session will be terminated at correct time.

Bug: b:160454261
Change-Id: I382d5bd3c7b5a64e49783ed97eec08e19ff91810
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283591Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Oleg Davydov <burunduk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805269}