Add a integration hook to get the wayland queue used by the QPA plugin

This comes handy for clients directly using raw wayland objects.

Change-Id: Ie526ac7b25a6c6a34ce61699103e612616bffbb8
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

src/client/qwaylandnativeinterface.cpp

@@ -66,6 +66,8 @@ void *QWaylandNativeInterface::nativeResourceForIntegration(const QByteArray &re
 
     if (lowerCaseResource == "display" || lowerCaseResource == "wl_display" || lowerCaseResource == "nativedisplay")
         return m_integration->display()->wl_display();
+    if (lowerCaseResource == "wl_event_queue")
+        return m_integration->display()->wl_event_queue();
     if (lowerCaseResource == "compositor")
         return const_cast<wl_compositor *>(m_integration->display()->wl_compositor());
     if (lowerCaseResource == "server_buffer_integration")