Re: [whatwg/streams] Add URL.createObjectURL(stream) support (#480)

Personally I could benefit a lot from the ability to turn an arbitrary readable stream into a URL.

I have a download button for large files, which must wait for a multipart data fetch to complete (this is the only fetch method currently available to me), parse a `File` from the result, then use the invisible anchor tag hack to initiate a download. This means the user isn't able to do anything nice like watch the progress as the file downloads, or open the file in a new tab and wait for it to load. Just a long pause and then... all downloaded!

What would be much better is if I could take a `ReadableStream` of the main file content which itself would read the `body` stream of the Fetch API (I already have this for streaming text and video content onto the page). Then I could create a URL out of that stream and its content type, render an `<a>` tag, and the browser could either load it in a separate tab or initiate a client download. I don't know how niche my use case is, but to be able to solve it would be extremely cool.

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