Separate motion event touch geometry orientation from stylus orientation.

ui/events/gesture_detection/motion_event.h

Index: ui/events/gesture_detection/motion_event.h
diff --git a/ui/events/gesture_detection/motion_event.h b/ui/events/gesture_detection/motion_event.h
index a6028fbdee52c3feb6394960f08ae0b563119270..40b7cd3fa2d387cbc9cb99d0312730aae933aad2 100644
--- a/ui/events/gesture_detection/motion_event.h
+++ b/ui/events/gesture_detection/motion_event.h
@@ -60,7 +60,7 @@ class GESTURE_DETECTION_EXPORT MotionEvent {
   virtual float GetRawY(size_t pointer_index) const = 0;
   virtual float GetTouchMajor(size_t pointer_index) const = 0;
   virtual float GetTouchMinor(size_t pointer_index) const = 0;
-  virtual float GetOrientation(size_t pointer_index) const = 0;
+  virtual float GetTouchOrientation(size_t pointer_index) const = 0;
   virtual float GetPressure(size_t pointer_index) const = 0;
   virtual ToolType GetToolType(size_t pointer_index) const = 0;
   virtual int GetButtonState() const = 0;
@@ -92,9 +92,9 @@ class GESTURE_DETECTION_EXPORT MotionEvent {
   float GetTouchMajor() const { return GetTouchMajor(0); }
   float GetTouchMinor() const { return GetTouchMinor(0); }
 
-  // Returns the orientation of the major axis clockwise from vertical, in
-  // radians. The return value lies in [-PI/2, PI/2].
-  float GetOrientation() const { return GetOrientation(0); }
+  // Returns the orientation of the touch major axis clockwise from vertical,
+  // in radians. The return value lies in [-PI/2, PI/2].
+  float GetTouchOrientation() const { return GetTouchOrientation(0); }
 
   float GetPressure() const { return GetPressure(0); }
   ToolType GetToolType() const { return GetToolType(0); }