Add tests for QQuickItem::childAt and antialiasing.
Add tests for QQuickItem::childAt and antialiasing.

Change-Id: I5dc26eaf27c201be05147c7bab4d6f0b0c926aed
Reviewed-by: Martin Jones <d1da02505c7f228af82a23235becb435f45569f5@nokia.com>

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