[whatwg/fetch] Expose decoded/encoded size for constructed responses (PR #1456)

Keep track of chunk sizes as the response stream is being read.

Closes https://github.com/w3c/navigation-timing/issues/124


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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1456


-- Commit Summary --

  * Expose decoded/encoded size for constructed responses

-- File Changes --

    M fetch.bs (26)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1456.patch

https://github.com/whatwg/fetch/pull/1456.diff


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