Enabled/disable touch screen in TabletPowerButtonController

ash/system/chromeos/power/tablet_power_button_controller.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SYSTEM_CHROMEOS_POWER_TABLET_POWER_BUTTON_CONTROLLER_H_
 #define ASH_SYSTEM_CHROMEOS_POWER_TABLET_POWER_BUTTON_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 54 matching lines @@
   void OnKeyEvent(ui::KeyEvent* event) override;
   void OnMouseEvent(ui::MouseEvent* event) override;
 
   // Overridden from ui::InputDeviceObserver:
   void OnStylusStateChanged(ui::StylusState state) override;
 
   // Overrides the tick clock used by |this| for testing.
   void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock);
 
  private:
-  // Set backlights to |forced_off| if they aren't already.
-  void SetBacklightsForcedOff(bool forced_off);
+  // Set backlights to |forced_off| and the corresponding enabled state of

[Daniel Erat, 2016/12/02 21:48:56]

nit: maybe this?

// Updates the power manager's backlights-forced-off state and
// enables or disables the touchscreen. No-op if 
// |backlights_forced_off_| already equals |forced_off|.

[Qiang(Joe) Xu, 2016/12/02 23:55:10]

Done.

+  // touchscreen if they aren't already.
+  void SetDisplayForcedOff(bool forced_off);
 
   // Sends a request to powerd to get the backlights forced off state so that
   // |backlights_forced_off_| can be initialized.
   void GetInitialBacklightsForcedOff();
 
   // Initializes |backlights_forced_off_|.
   void OnGotInitialBacklightsForcedOff(bool is_forced_off);
 
   // Starts |shutdown_timer_| when the power button is pressed while in
   // tablet mode.
@@ skipping 29 matching lines @@
   LockStateController* controller_;  // Not owned.
 
   base::WeakPtrFactory<TabletPowerButtonController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabletPowerButtonController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_POWER_TABLET_POWER_BUTTON_CONTROLLER_H_