Verifies that Overlay.setShowGridOverlays works together with Emulation.setDeviceMetricsOverride.
Expected 3 track size labels; actual: 3
Positions: 
{
    bottom : 26.53125
    height : 17
    left : 381.9375
    right : 418.046875
    top : 9.53125
    width : 36.109375
}
{
    bottom : 22.375
    height : 17
    left : 9.53125
    right : 39.625
    top : 5.375
    width : 30.09375
}
{
    bottom : 37.078125
    height : 17
    left : 9.53125
    right : 39.625
    top : 20.078125
    width : 30.09375
}