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This isn't the best code I ever wrote but it's better than what's there. This rewrites
ReactDefaultPerf
to be actionable and is structured so we can integrate it into the devtools later. Still needs more testing but putting this out for initial feedback.I did a video demo here: http://www.youtube.com/watch?v=Xc53eUYDt6I&feature=youtu.be
We could strip out the measure() calls with a build step similar to invariant() if we want to get rid of the size increase: