autoSave not working for android device

[ashu171093]

Added onAutoSaveNeeded to save chart after every 5 seconds like below
widget.subscribe('onAutoSaveNeeded', () => {
widget.saveChartToServer(()=>{
},() => {
},{defaultChartName:"ChartLayout"})
});

This is properly work for ios device(chart get save after every 5 second as per required )but not working for android device