Resuming from suspend should stop backlights forced off if they are

ash/system/chromeos/power/tablet_power_button_controller.cc

Index: ash/system/chromeos/power/tablet_power_button_controller.cc
diff --git a/ash/system/chromeos/power/tablet_power_button_controller.cc b/ash/system/chromeos/power/tablet_power_button_controller.cc
index 06d9efae2292990d999ea471bae6c94bf3424912..bd52b98a83a518168425597b1184b32e571aa33d 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller.cc
@@ -98,6 +98,10 @@ void TabletPowerButtonController::OnPowerButtonEvent(
   // don't turn the screen off in response to the events.
   if (timestamp - last_resume_time_ <=
       base::TimeDelta::FromMilliseconds(kIgnorePowerButtonAfterResumeMs)) {
+    // If backlights are forced off, stop forcing off because resuming system
+    // doesn't handle this.
+    if (down && backlights_forced_off_)
+      SetBacklightsForcedOff(false);
     return;
   }