Ojan Vafai 6d49e56b24 Simplify the paint invalidation bits.
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
2015-01-15 13:02:00 -08:00
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