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0be786f62c
-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