Enabled/disable touch screen in TabletPowerButtonController

chrome/browser/chromeos/system/input_device_settings.h

Index: chrome/browser/chromeos/system/input_device_settings.h
diff --git a/chrome/browser/chromeos/system/input_device_settings.h b/chrome/browser/chromeos/system/input_device_settings.h
index 5cf208f29a27b384e3d53e4eaf9dad212c6a6cdf..d3bb1a6c51c807009b7b5cfca0e9210e89c01207 100644
--- a/chrome/browser/chromeos/system/input_device_settings.h
+++ b/chrome/browser/chromeos/system/input_device_settings.h
@@ -174,16 +174,28 @@ class CHROMEOS_EXPORT InputDeviceSettings {
   // where other input devices like mouse are absent.
   static bool ForceKeyboardDrivenUINavigation();
 
+  // Registers local pref names for touch screen status.

[Daniel Erat, 2016/12/02 21:48:57]

nit: s/touch screen/touchscreen/

[Qiang(Joe) Xu, 2016/12/02 23:55:11]

Done.

+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
   // Registers profile pref names for touchpad and touch screen statuses.
   static void RegisterProfilePrefs(PrefRegistrySimple* registry);
 
-  // Updates the on/off status of the touchscreen/touchpad from the active
-  // user's preferences.
-  void UpdateTouchDevicesStatusFromActiveProfilePrefs();
+  // Updates the on/off status of the touchscreen/touchpad from the preferences.
+  void UpdateTouchDevicesStatusFromPrefs();
+
+  // If |is_local| is true, returns the touchscreen status from local prefs,
+  // otherwise from user prefs.
+  bool IsTouchscreenEnabledInPrefs(bool is_local) const;
+
+  // Sets the status of touchscreen to |enabled| in prefs. If |is_local|, pref
+  // is set in local pref, otherwise in user pref.

[Daniel Erat, 2016/12/02 21:48:57]

nit: s/local pref/local state/

[Qiang(Joe) Xu, 2016/12/02 23:55:11]

Done.

+  void SetTouchscreenEnabledInPrefs(bool enabled, bool is_local);
+
+  // Updates the on/off status of the touchscreen from the combination of local
+  // and user's preferences.
+  void UpdateTouchscreenStatusFromPrefs();
 
-  // Toggles the status of Touchscreen/Touchpad on or off and updates the local
-  // prefs.
-  void ToggleTouchscreen();
+  // Toggles the status of touchpad on or off and updates the user prefs.
   void ToggleTouchpad();
 
   // Calls |callback|, possibly asynchronously, after determining if a touchpad