When fixing https://bugs.webkit.org/show_bug.cgi?id=47016, I added LayoutTests/compositing/tiling/huge-layer-img.html. I ended up needing to file platform-specific expectations, because the bounds for Chromium were 6 pixels taller and the image layer was placed 4 pixels differently than the Safari version. This bug is to reconcile these two expectation files, as there should not be any differences here. In a visual inspection, I could not see even a 1 pixel difference between the two renderings, so this may just be an issue with the reporting via layerTreeAsText.