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This is an optimization to avoid painting backgrounds that are obscured. It's a lot of complexity that it's not clear we'll need given that we're using a GL backend. Also, we can add it back in more easily/efficiently in the future once we have a display list architecture. This also means we can remove the needsPaintInvalidation dirty bit and some opacity information on filters. R=esprehn@chromium.org Review URL: https://codereview.chromium.org/856563006