LayoutTests/fast/harness/platform-layer-tree-as-text-expected.txt

(structural layer
  (position 200.00 200.00)
  (bounds 200.00 200.00)
  (children
    (backdrop layer
      (position 0.00 0.00)
      (bounds 200.00 200.00)
    )
    (platform layer
      (position 100.00 100.00)
      (bounds 200.00 200.00)
    )
  )
)