var paint = function(rAF){ 'use strict';
  return function paint(before) {
    before();
    return rAF(before), {
      then: function (after) {
        return rAF(rAF.bind(null, after)), this;
      }
    };
  };
}(
  self.requestAnimationFrame ||
  self.webkitRequestAnimationFrame ||
  self.mozRequestAnimationFrame ||
  self.oRequestAnimationFrame ||
  self.msRequestAnimationFrame ||
  function(fn) { setTimeout(fn, 1000 / 60); }
);