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This is a reland of https://crrev.com/c/2538590, which was reverted
by mistake. The actual failure was caused by another CL
(https://crrev.com/c/2537939) which was also reverted.
No changes were made in this CL from the original.

TBR=jamescook@chromium.org

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

BUG=1142994
TEST=Added new tests

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-Original-Commit-Position: refs/heads/master@{#828602}
Change-Id: I2a7fa62844971c1874dd8266472717c09f365739
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2548272Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829018}