code: function wrapPlay (playMethod) {
    return function play () {
      var sceneEl = this.el.sceneEl;
      var shouldPlay = this.el.isPlaying && !this.isPlaying;
      if (!this.initialized || !shouldPlay) { return; }
      playMethod.call(this);
      this.isPlaying = true;
      this.eventsAttach();
      // Add tick behavior.
      if (!hasBehavior(this)) { return; }
      sceneEl.addBehavior(this);
    };
  }
docs: Wrapper for defined play method.
  Play component by adding tick behavior and calling user's play method.
  
  @param playMethod {function}