Ojan Vafai 0be786f62c Simplify and reduce calls to beginTransparencyLayers.
-Consolidate the beginTransparencyLayers calls. The call
on layer()->parent() was just not needed as best I can tell
and the filter one could just be shared with the non-filter
codepath. FWIW, blink has already made a similar set of changes.
-Don't walk up the tree calling beginTransparencyLayer.
We're doing this in a recursive call down, so we've already
created the transparency layer for any transparent ancestors.
-Remove unused TransparencyClipBoxMode argument.
-Inline the paintingExtent method.
-Removed unused REVEAL_TRANSPARENCY_LAYERS #define.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/959543002
2015-02-24 17:29:00 -08:00
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