GitLab

Fix a (long-standing?) race where
chromeos::PowerManagerClient could notify RendererFreezer
that a suspend attempt was imminent *after* already telling
it that the attempt was done.

Also make PowerManagerClient not notify powerd about regular
or dark suspend readiness after it's already seen a
SuspendDone signal.

Add a bunch of unit tests exercising this code, too, and
rework the comments on some previously-added tests.

BUG=646912

Review-Url: https://codereview.chromium.org/2340153002
Cr-Commit-Position: refs/heads/master@{#418887}