		AllowAdditionalProperties (TGoogleBaseObject)
pt		SethistoryId (TMessage)
pt		Setid (TMessage)
pt		SetinternalDate (TMessage)
pt		SetlabelIds (TMessage)
pt		Setpayload (TMessage)
pt		Setraw (TMessage)
pt		SetsizeEstimate (TMessage)
pt		Setsnippet (TMessage)
pt		SetthreadId (TMessage)