Update PointerEvent handled state correctly in OnWindowInputEvent.

ui/aura/mus/window_tree_client.cc

Index: ui/aura/mus/window_tree_client.cc
diff --git a/ui/aura/mus/window_tree_client.cc b/ui/aura/mus/window_tree_client.cc
index c3bdece523a654b38ceff5cfb6df6c1b0b94852b..257347304ff4537083419d4016c8a639fc719a71 100644
--- a/ui/aura/mus/window_tree_client.cc
+++ b/ui/aura/mus/window_tree_client.cc
@@ -1242,17 +1242,20 @@ void WindowTreeClient::OnWindowInputEvent(uint32_t event_id,
     if (event->type() == ui::ET_POINTER_WHEEL_CHANGED) {
       ui::MouseWheelEvent mapped_event(*event->AsPointerEvent());
       DispatchEventToTarget(&mapped_event, window);
+      ack_handler.set_handled(mapped_event.handled());
     } else {
       ui::MouseEvent mapped_event(*event->AsPointerEvent());
       DispatchEventToTarget(&mapped_event, window);
+      ack_handler.set_handled(mapped_event.handled());
     }
   } else if (event->IsTouchPointerEvent()) {
     ui::TouchEvent mapped_event(*event->AsPointerEvent());
     DispatchEventToTarget(&mapped_event, window);
+    ack_handler.set_handled(mapped_event.handled());
   } else {
     DispatchEventToTarget(event.get(), window);
+    ack_handler.set_handled(event->handled());
   }
-  ack_handler.set_handled(event->handled());
 }
 
 void WindowTreeClient::OnPointerEventObserved(std::unique_ptr<ui::Event> event,