Listen for SuspendDone D-Bus signal from powerd.

Use SuspendDone instead of the old, poorly-defined
PowerStateChanged signal.

BUG=chromium:359619
TEST=manual: tail /var/log/net.log while running
     powerd_dbus_suspend and and waking the system; verify
     that suspend and resume are reported

Change-Id: I2eb27d2e4a53497116e8610f5ab77813d3a313d8
Reviewed-on: https://chromium-review.googlesource.com/194950
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Daniel Erat <derat@chromium.org>
Tested-by: Daniel Erat <derat@chromium.org>
5 files changed