docs: function Sample(cpu, thread, title, start, leafStackFrame,
                    opt_weight, opt_args) {
      tr.model.TimedEvent.call(this, start);
  
      this.title = title;
      this.cpu = cpu;
      this.thread = thread;
      this.leafStackFrame = leafStackFrame;
      this.weight = opt_weight;
      this.args = opt_args || {};
    }