Bug #: 5969

Bug #: 5969
Submitted by: Alexander Kellett  <lypanov@kde.org>
Reviewed by: eseidel
        Basic support for <mask> tag.
        http://bugzilla.opendarwin.org/show_bug.cgi?id=5969

        * svg/W3C-SVG-1.1/masking-mask-01-b-expected.txt: updated.
        * svg/custom/grayscale-gradient-mask-expected.checksum: Added.
        * svg/custom/grayscale-gradient-mask-expected.png: Added.
        * svg/custom/grayscale-gradient-mask-expected.txt: Added.
        * svg/custom/grayscale-gradient-mask.svg: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@11905 268f45cc-cd09-0410-ab3c-d52691b4dbfc