All problems covered by existing LayoutTests. Unfortunately, when pixel tests aren't looked at, there is no way anyone could notice :(
svg/W3C-SVG-1.1/masking-mask-01-b.svg - masks seem translated
svg/custom/mask-inside-defs.svg - broken
svg/custom/visibility-override-mask.svg - broken
Found the culprit: http://trac.webkit.org/changeset/31830/trunk/WebCore/svg/graphics/cg/SVGResourceMaskerCg.mm
Uploading fix soon.
Created attachment 22744 [details]
Would be nice if David could have a look, as one of his refactorings broke SVG <mask> support.
Comment on attachment 22744 [details]
Landed in r35694.