Gst.Message.new_progress

function new_progress(src:Gst.Object, type:Gst.ProgressType, code:String, text:String):Gst.Message {
    // Gjs wrapper for gst_message_new_progress()
}

Progress messages are posted by elements when they use an asynchronous task to perform actions triggered by a state change.

code contains a well defined string describing the action. @test should contain a user visible string detailing the current action.