Re: [ServiceWorker] what should the document base URI for an intercepted navigation (#787)

>From the F2F discussion I'd like to capture a few options:

 - regardless of which way we decide this, we can extend `Request`s from pages with extra content about the base URL, which would allow a SW to handle these sub requests however it likes
 - we can do this for both CSS and main-document-generated fetches, allowing us to more easily adopt a single policy for both (which I know @ehsan favors)
 - we can extend the `Response` constructor to allow a base to be specified, bringing synthetic responses in line with `fetch()`'d responses.

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https://github.com/slightlyoff/ServiceWorker/issues/787#issuecomment-175198179