Re: [w3c/ServiceWorker] Include imported scripts to byte-check (#1023)

I think @jakearchibald and @wanderview largely suggested the same thing. Basically byte-check will populate a temporary map if the fetched resource is new. `importScripts()` will consult this map (to populate SW's script resource's imported scripts map*) before fetching through HTTP cache/network until the imported scripts updated flag is set. Once the flag is set, `importScripts()` always returns the results from the imported scripts map.

I think if we define and maintain the temporary map on a service worker registration, we should nothing but add and update the entry throughout the registration's lifetime.

I'll add this change to the PR.

(*) This is the SW's script resource map in the current spec. I suggested changing the name and the location of the concept as such through this PR for clarity and a better interface to other algorithms.

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