UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2946.0 Safari/537.36

Steps to reproduce the problem:
*Not an issue, just some questions regarding Chrome's specific implementation*

1. Does Chrome ever update a service in the background, NOT as part of a navigation event to a service worker-controlled URL? For example, if someone visits https://my-site.com once, never visits it again, and uses their browser regularly and leaves it running, when would the service worker for https://my-site.com auto update (if ever)?

2. Does the service worker perform an update check when it receives a push event from a received push notification? And if the same https://my-site.com was only visited once and the user subscribed to push, and a week elapsed between push notifications, the newest push notification would trigger a service worker update right?

What is the expected behavior?

What went wrong?
*Not an issue, just a question*

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 57.0.2946.0  Channel: dev
OS Version: OS X 10.11.6
Flash Version: