Ojan Vafai 4256d4a224 Remove background obscuration checks.
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
2015-01-15 17:11:44 -08:00
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