QtQuick animation speed is tied to framerate

After updating QMLBench to disable vsync, it has become apparent that animation speed is tied to frame time, not clock time. With vsync disabled, animations are clearly faster or slower depending on the framerate of the rendered scene.

This occurs with both 2d and 3d benchmarks, and the issue is apparent when running at <60fps as well, meaning that animations will vary in speed with an application's ability to achieve the reference 60fps. This also implies that animations would run at half speed on a 30hz display, and double speed or more on a high refresh rate display.