events: Preserve pointer details in native MouseEvent constructor

ui/events/cocoa/events_mac.mm

Index: ui/events/cocoa/events_mac.mm
diff --git a/ui/events/cocoa/events_mac.mm b/ui/events/cocoa/events_mac.mm
index bf0dd31bdb3dcfb73098750405adeed3cce9fe98..804ffbd5d57b0d103238791fa68eb92befbdf797 100644
--- a/ui/events/cocoa/events_mac.mm
+++ b/ui/events/cocoa/events_mac.mm
@@ -134,6 +134,11 @@ int GetChangedMouseButtonFlagsFromNative(
   return 0;
 }
 
+PointerDetails GetMousePointerDetailsFromNative(
+    const base::NativeEvent& native_event) {
+  return PointerDetails(EventPointerType::POINTER_TYPE_MOUSE);
+}
+
 gfx::Vector2d GetMouseWheelOffset(const base::NativeEvent& event) {
   if ([event respondsToSelector:@selector(hasPreciseScrollingDeltas)] &&
       [event hasPreciseScrollingDeltas]) {