[Android] Map raw touch coordinates to global gesture locations

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 899aeea1c2ae7b8530cfbb1af15e57824bb2b29d..3cf4235b78a37815d1b800fd86aa50b4960d694f 100644
--- a/ui/events/gesture_detection/motion_event.h
+++ b/ui/events/gesture_detection/motion_event.h
@@ -62,6 +62,8 @@ class GESTURE_DETECTION_EXPORT MotionEvent {
   float GetY() const { return GetY(0); }
   float GetRawX() const { return GetRawX(0); }
   float GetRawY() const { return GetRawY(0); }
+  float GetRawOffsetX() const { return GetRawX() - GetX(); }
+  float GetRawOffsetY() const { return GetRawY() - GetY(); }
   float GetTouchMajor() const { return GetTouchMajor(0); }
   float GetPressure() const { return GetPressure(0); }
 };