Re: [w3c/ServiceWorker] serviceworker for iframes with srcdoc (#765)

> Note: I strongly feel both about:blank (no matter whether it goes through fetch or not) and about:srcdoc should NOT have a controller. They are NOT able to match any registration, so should be considered in non-controlled state. (The active service worker of those documents' environment is null by default.) So, going back to the OP issue, only when sandbox="allow-same-origin" comes together with srcdoc="/* source */", the iframe should inherit its parent's active service worker, if one exists.

Since about:blank iframes inherit the origin from the parent, I don't see why they shouldn't inherit the controller as well.  Without this how can a page programmatically build an iframe DOM in an offline state?  Elements added to the child frame wouldn't be intercepted.

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