Reviewed by Nikolas Zimmermann.

        Complex test of mask with every combination of maskUnits and maskContentUnits
        as well as different values for size and position of the mask and it's content.

        * platform/mac/svg/custom/mask-with-all-units-expected.checksum: Added.
        * platform/mac/svg/custom/mask-with-all-units-expected.png: Added.
        * platform/mac/svg/custom/mask-with-all-units-expected.txt: Added.
        * svg/custom/mask-with-all-units.svg: Added.
2009-11-30  Dirk Schulze  <krit@webkit.org>

        Reviewed by Nikolas Zimmermann.

        REGRESSION (r49757): masking-mask-01-b.svg rendered incorrectly
        [https://bugs.webkit.org/show_bug.cgi?id=31980]

        It turns out, that we did not handle maskUnits="userSpaceOnUse"
        correctly. We just need to move the context of the maskImage
        if maskContentUnits="objectBoundingBox". The context gets scaled
        on this unit combination, so we have to substract the position of
        the targetRect. On userSpaceOnUse the position just depends on the
        position of the mask element.
        I added a test with some senseless and reasonable values for size
        and postion of the mask and it's contents. I also used every
        combination of maskUnits and maskContentUnits to be sure, that it
        is fixed this time.

        Test: svg/custom/mask-with-all-units.svg

        * svg/SVGMaskElement.cpp:
        (WebCore::SVGMaskElement::drawMaskerContent):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51496 268f45cc-cd09-0410-ab3c-d52691b4dbfc