Re: [spec-reviews] Performance Observer Review (formerly Navigation Timing 2 concepts) (#18)

As far as I can tell, [Mozilla's implementation](https://bugzilla.mozilla.org/show_bug.cgi?id=1165796) is feature complete (including new getEntries filtering) and integration with all the shipped perf APIs (user, nav, and resource timing). 

The implementation in Chrome enables PerfObserver interface and integrates with User + Resource Timing. Nav Timing support is missing because we need to update our NT implementation to v2 -- once that's done the observer support will be there.

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