[w3c/ServiceWorker] should a frame navigated to about:blank inherit a service worker controller? (#1350)

Currently we inherit a service worker controller from the parent frame when a srcdoc or initial about:blank frame is created.  Should some form on inheritance happen when an iframe with a non-blank URL gets navigated to about:blank?

If so, where should the service worker be inherited from.  Apparently some browsers inherit the origin from the navigation initiator instead of the parent.  Should service worker inheritance match?  (This is a similar question to #1261).

This question was raised in https://crbug.com/880768.

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