[Touch Adjustment] Pass primary_pointer_type to WebGestureEvent and disable adjustment for stylus

ui/events/gesture_event_details.h

Index: ui/events/gesture_event_details.h
diff --git a/ui/events/gesture_event_details.h b/ui/events/gesture_event_details.h
index 907a940ead868748be92cd5c062abe0fc440ab30..f7bfb90f7df65026604d5e4ee51fc3e44093b80a 100644
--- a/ui/events/gesture_event_details.h
+++ b/ui/events/gesture_event_details.h
@@ -54,6 +54,13 @@ struct EVENTS_BASE_EXPORT GestureEventDetails {
         is_source_touch_event_set_non_blocking;
   }
 
+  EventPointerType primary_pointer_type() const {
+    return primary_pointer_type_;
+  }
+  void set_primary_pointer_type(EventPointerType primary_pointer_type) {
+    primary_pointer_type_ = primary_pointer_type;
+  }
+
   int touch_points() const { return touch_points_; }
   void set_touch_points(int touch_points) {
     DCHECK_GT(touch_points, 0);
@@ -236,6 +243,10 @@ struct EVENTS_BASE_EXPORT GestureEventDetails {
 
   bool is_source_touch_event_set_non_blocking_ = false;
 
+  // The pointer type for the first touch point in the gesture.
+  EventPointerType primary_pointer_type_ =
+      EventPointerType::POINTER_TYPE_UNKNOWN;
+
   int touch_points_;  // Number of active touch points in the gesture.
 
   // Bounding box is an axis-aligned rectangle that contains all the