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In this CL, we handle:
- Imminent suspends.
- User switches in multi-profile sessions.

BUG=1142994
TEST=Added new tests

Change-Id: I31da5c8cfb4f2648b2a34b206673eb59cce69f29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538590
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828602}