Enabled/disable touch screen in TabletPowerButtonController

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..619ce300fce41c371554fa5a429c69dd31a4da20 100644
--- a/ash/system/chromeos/power/tablet_power_button_controller.cc
+++ b/ash/system/chromeos/power/tablet_power_button_controller.cc
@@ -6,6 +6,7 @@
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/session/session_state_delegate.h"
+#include "ash/common/shell_delegate.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
@@ -182,8 +183,16 @@ void TabletPowerButtonController::SetBacklightsForcedOff(bool forced_off) {
       ->SetBacklightsForcedOff(forced_off);
   backlights_forced_off_ = forced_off;
 
+  // ToggleTouchscreen when there is a request/stop backlights forced off call
+  // and touch screen should be toggled.
+  WmShell* wm_shell = WmShell::Get();
+  const bool touch_screen_disabled =
+      !wm_shell->delegate()->IsTouchscreenEnabled();
+  if (touch_screen_disabled ^ forced_off)
+    wm_shell->delegate()->ToggleTouchscreen();
+
   // Send an a11y alert.
-  WmShell::Get()->accessibility_delegate()->TriggerAccessibilityAlert(
+  wm_shell->accessibility_delegate()->TriggerAccessibilityAlert(
       forced_off ? A11Y_ALERT_SCREEN_OFF : A11Y_ALERT_SCREEN_ON);
 }