ash: Start shutdown timer on post-resume power button press

ash/system/chromeos/power/tablet_power_button_controller.h

Index: ash/system/chromeos/power/tablet_power_button_controller.h
diff --git a/ash/system/chromeos/power/tablet_power_button_controller.h b/ash/system/chromeos/power/tablet_power_button_controller.h
index f59749d668af7a2fe16ef0e07df92e0ab961ac65..59c606d29210d46e8bd819bc1ee9fbb8895b3add 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller.h
+++ b/ash/system/chromeos/power/tablet_power_button_controller.h
@@ -111,6 +111,9 @@ class ASH_EXPORT TabletPowerButtonController
   // updated in SuspendDone().
   base::TimeTicks last_resume_time_;
 
+  // True if power button released should force off display.
+  bool force_off_on_button_up_;
+
   // Started when the tablet power button is pressed and stopped when it's
   // released. Runs OnShutdownTimeout() to start shutdown.
   base::OneShotTimer shutdown_timer_;