Re: [whatwg/fetch] Expose Stream Watermarks (#689)

Just exposing watermarks would be a great start for what I need, although to be fair it looks like no browsers handle backpressure:

```
(async () => {
   const r = await fetch('https://storage.googleapis.com/long-mp4-file.mp4', {
     cache: 'no-store'
   });
   const reader = r.body.getReader();
   var i = 10;
   while(i --> 0) { 
     await new Promise(r => setTimeout(r, 2000));
     console.log(await reader.read());
   }
   reader.cancel();
})(); 
```

Every browser I tested (FF, Safari and Chrome) downloaded the whole 75mb video. Is this just a bug in the implementation or am I doing something wrong? 


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