Re: [whatwg/fetch] Proposal: add a boolean flag `render-blocking` to the `request` object (Issue #1433)

I believe what @xiaochengh meant is that Chromium exposes this to traces, which are [used](https://blog.webpagetest.org/posts/new-render-blocking-indicator-in-chrome-and-webpagetest/) by developer tooling, and found to be [useful by developers](https://sia.codes/posts/render-blocking-resources/).

It's a different use case, but e.g. makes me think we should [web expose](https://github.com/w3c/resource-timing/issues/262) this info in Resource Timing. I agree that an internal flag would be sufficient for that.

I guess that for web-exposing the flag on the Request object itself we'd need a Service-Worker case that e.g. treats scripts and style requests differently when they are render blocking.

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