ad';
    const g = new AsyncSliceGroup(t1);
    g.push(newAsyncSliceEx(
        { title: 'VeryBusy',
          start: 0, duration: 1 }));
    g.push(newAsyncSliceEx(
        { cat: 'renderer.scheduler',
          id: ':ptr:0xdeadbeef', title: 'FrameScheduler.Foo',
          start: 0.5, duration: 0.1 }));
    g.push(newAsyncSliceEx(
        { cat: 'renderer.scheduler',
          id: ':ptr:0xdeadbeef', title: 'FrameScheduler.Bar',
          start: 0.55, duration: 0.2 }));
    g.push(newAsyncSliceEx(
        {