virtual int32 AddVariableToHistory ( [FHistory](API\Plugins\NiagaraEditor\TNiagaraParameterMapHistoryBuild-\FHistory) & History, const [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) & InVar, const [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) & InAliasedVar, const [FPin](API\Plugins\NiagaraEditor\TNiagaraParameterMapHistoryBuild-\FPin) * InPin )