I agree with this. Chrome has effectively changed the entire nature of client-side computing with this feature. If you want to run stuff client-side any more (hello Windows? Anybody listening?), you're going to need to implement this.

In general, the user should extremely rarely be interrupted for anything, especially not anything program-related. Each program having a tray icon, an update alert, update restarts, and flow interruption because it thinks something is important is what has turned windows from a productive computing platform to some kind of cross between a Kafkaesque X-box and a slot machine.