there are ecore APIs related with aux_hint.
it is need to check add aux_hint feature into wayland 2.
ecore_wayland: handle 'aux_message' event and create its ecore event
ecore_wayland: support aux_hint(auxiliary hint) for wayland surface
Usecase: backward compatability.
If the task was alredy implemented, we will close this task.(To check that the task is alredy implement can be task)