Enabled/disable touch screen in TabletPowerButtonController

ash/common/shell_delegate.h

Index: ash/common/shell_delegate.h
diff --git a/ash/common/shell_delegate.h b/ash/common/shell_delegate.h
index 27d59cff49f0f1b6b4e3b1e0bf4625e1c04a92fe..afb539f1fcd1b43e575025d6227812ee1dec5be5 100644
--- a/ash/common/shell_delegate.h
+++ b/ash/common/shell_delegate.h
@@ -133,9 +133,14 @@ class ASH_EXPORT ShellDelegate {
 
   virtual gfx::Image GetDeprecatedAcceleratorImage() const = 0;
 
-  // Toggles the status of the touchpad / touchscreen on or off.
+  // Returns true if touchscreen is on, otherwise false.
+  virtual bool IsTouchscreenEnabled() const = 0;
+
+  // Sets the status of touchscreen to |enabled|.
+  virtual void SetTouchscreenEnabled(bool enabled) {}

[Daniel Erat, 2016/11/30 22:58:07]

should this also be abstract? it feels a bit strange to have an abstract
IsTouchscreenEnabled() method but this possibly-unimplemented
SetTouchscreensEnabled() method. (i realize that this is probably due to the old
ToggleTouchscreen() method having an empty definition here.)

[Qiang(Joe) Xu, 2016/12/02 17:42:51]

Done.

+
+  // Toggles the status of the touchpad on or off.
   virtual void ToggleTouchpad() {}
-  virtual void ToggleTouchscreen() {}
 };
 
 }  // namespace ash