[Bug 772608] rpi/dispmanx: Implement gst_video_overlay_set_window_handle() for dispmanx window

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772608

--- Comment #5 from Munez <munezbn.dev at gmail.com> ---
Additionally we may have to remove element added by player before setting new
element, something like below ?

    if(window_egl->native.element != 0) {
      GST_DEBUG_OBJECT (window, "Remove existing native element");
      update = vc_dispmanx_update_start(0);
      vc_dispmanx_element_remove(update, window_egl->native.element);
      vc_dispmanx_update_submit_sync(update);
    } 

I noticed that even before set_window_handle is called, player adds a window by
calling resize_window(16x16)..

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