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The only thing they're used for now is to clear the background obscuration state on RenderBox. They're also used in RenderLayerModelObject::styleWillChange, but that usage seems like a huge premature optimization. Unfortunately, the RenderBox one walks up the ancestor chain, so it's likely a necessary performance optimization. R=esprehn@chromium.org Review URL: https://codereview.chromium.org/851033002