Re: [whatwg/fetch] Observer API for fetch groups (#65)

Besides some of the use cases described in https://github.com/w3c/performance-timeline/issues/13#issuecomment-111152115, we're also having a need for a Fetch Observer when trying to develop a Time-To-Interactive metric that's based on signals like LongTasks, FPS, and networking activity.    

We'd like to know when networking activity is below some level (i.e. n resources outstanding), and there's no way to do this today in a complete and performant way.

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