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..169ff0899ea22003305348de1c38871c4d40cfbc 100644
--- a/ash/common/shell_delegate.h
+++ b/ash/common/shell_delegate.h
@@ -133,6 +133,9 @@ class ASH_EXPORT ShellDelegate {
 
   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() {}