Enabled/disable touch screen in TabletPowerButtonController

ash/common/shell_delegate.h

 // Copyright (c) 2012 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_COMMON_SHELL_DELEGATE_H_
 #define ASH_COMMON_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 115 matching lines @@
   // Creates a GPU support object. Shell takes ownership of the object.
   virtual GPUSupport* CreateGPUSupport() = 0;
 
   // Get the product name.
   virtual base::string16 GetProductName() const = 0;
 
   virtual void OpenKeyboardShortcutHelpPage() const {}
 
   virtual gfx::Image GetDeprecatedAcceleratorImage() const = 0;
 
+  // Returns true if touchscreen is on, otherwise false.
+  virtual bool IsTouchscreenEnabled() const = 0;
+
   // Toggles the status of the touchpad / touchscreen on or off.
   virtual void ToggleTouchpad() {}

[Daniel Erat, 2016/11/29 21:03:36]

"toggle" methods always seem a bit strange to me, unless the thing that they're
doing is asynchronous. assuming that this is synchronous, could you add a
SetTouchscreenEnabled(bool) method and call that instead?

[Qiang(Joe) Xu, 2016/11/30 22:09:11]

done

   virtual void ToggleTouchscreen() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELL_DELEGATE_H_