Re: [whatwg/fetch] FetchObserver (for a single fetch) (#607)

Hi,
I found no way of observing the progress on Upload fetch()

var garbage = new Float64Array(new ArrayBuffer(104856))
for (let i=0; i<garbage.length; i++) garbage[i] = Math.random()
var gArray = []
for (let i=0; i<100; i++) gArray.push(garbage);
var gBlob = new Blob(gArray)  //10MB

var controller = new FetchController(); // FF55 or AbortController() in Firefox58
var signal = controller.signal;
fetch( "/?action=upload",{ signal, observe(observer) { observer.onresponseprogress=e=>console.log(e);observer.onrequestprogress=e=>console.log(e);observer.onstatechange=n=>console.log(observer.state) }, method:"POST", body:gBlob } )

The only working observer is "state" ( Firefox 55/58 Ubuntu)

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