Gradual memory leak when doing infinite repaint on empty scene

1. Open attached project
2. In Editor, Window > SceneViewRepainter
3. In the new window that opens, click on Start while observing the memory used by Unity

Expected: Memory usage should remain steady
Observed: Memory usage very gradually goes up over time without further user input

Occurring on: 5.5.4f1, 5.6.1f1, 2017.1.0b1, 2017.1.0b9, 2017.2.0a1, 2017.2.0a4 (current latest trunk)