cros: stop forcing off display when powerd reports SuspendDone

ash/system/power/tablet_power_button_controller.cc

Index: ash/system/power/tablet_power_button_controller.cc
diff --git a/ash/system/power/tablet_power_button_controller.cc b/ash/system/power/tablet_power_button_controller.cc
index 4beeb3e4c26ae88b9ab83dba45320895564a63f0..58e9a8d4cd5535e5d0d86f6c22244aeedb8a4de9 100644
--- a/ash/system/power/tablet_power_button_controller.cc
+++ b/ash/system/power/tablet_power_button_controller.cc
@@ -159,6 +159,10 @@ void TabletPowerButtonController::BrightnessChanged(int level,
 void TabletPowerButtonController::SuspendDone(
     const base::TimeDelta& sleep_duration) {
   last_resume_time_ = tick_clock_->NowTicks();
+  // Device should always stopped forcing off backlights when suspend is done.
+  // This will handle the case when tablet power button pressed causing system
+  // resuming, but power button event is not delivered.

[Daniel Erat, 2017/06/22 18:08:40]

nit: maybe just something like:

// Stop forcing backlights off on resume to handle situations
// where the power button resumed but we didn't receive the
// event: http://crbug.com/735291

[Qiang(Joe) Xu, 2017/06/22 18:36:35]

Done.

+  SetDisplayForcedOff(false);
 }
 
 void TabletPowerButtonController::LidEventReceived(