React profiling bookmarklet

react_prof.js

(function() {
    var Perf = React.addons.Perf;
    var is_active = window.reactProfileActive || false;
    if (!is_active) {
        Perf.start();
    }
    else {
        Perf.start();
        measurements = Perf.getLastMeasurements();
        Perf.printInclusive(measurements);
        Perf.printWasted(measurements);
        window.reactMeasurements = measurements;
    }

    window.reactProfileActive = !is_active;
})();