SVG allocates needlessly huge pattern tiles during rendering
SVG needs method to find final rendered size for a given length
This is really just a simple bit of code which figures out the current absoluteTransform and applies it to a given length. This could be used by bug 5526 as well.
This currently causes svg/custom/pattern-in-defs.svg to intermittently fail.
Fixed by bug 12013 patch. Landed in r18521.