AddCueEvent
public class AddCueEvent : NSObject, TextTrackCueEventProtocolFired when TextTrackEventTypes.ADD_CUE occurs for  the list of TextTrackCues.
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                  The textual representation of the type of event, “addcue”. DeclarationSwift public let type: String
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                  The date at which the event occurred. DeclarationSwift public let date: Date
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                  The TextTrackCuethat was added.DeclarationSwift public let cue: TextTrackCue
