Verifies that Overlay.setShowGridOverlays works together with Emulation.setDeviceMetricsOverride.
Expected 3 track size labels; actual: 3
Positions: 
{
    bottom : 27.53125
    height : 18
    left : 382
    right : 418
    top : 9.53125
    width : 36
}
{
    bottom : 23.6875
    height : 18
    left : 9.53125
    right : 39.53125
    top : 5.6875
    width : 30
}
{
    bottom : 40.015625
    height : 18
    left : 9.53125
    right : 39.53125
    top : 22.015625
    width : 30
}