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These appear to have been for ensuring that you only paint elements in a given subtree. It's not clear to me exactly how you get to painting an element that is not rooted at the RenderLayer you started with. I think it's just not possible in Sky anymore. This code was added in 2004 for drag images, which we no longer support. R=esprehn@chromium.org Review URL: https://codereview.chromium.org/882223005