Reviewed by eseidel.  Landed by eseidel.
        
        Implemented feDisplacementMap.
        http://bugzilla.opendarwin.org/show_bug.cgi?id=5862

        Test: svg/custom/feDisplacementMap-01.svg

        * WebCore.xcodeproj/project.pbxproj: added files.
        * kcanvas/KCanvasFilters.cpp:
        (WebCore::KCanvasFEDisplacementMap::externalRepresentation):
        * kcanvas/KCanvasFilters.h:
        (WebCore::KCanvasFEDisplacementMap::KCanvasFEDisplacementMap):
        (WebCore::KCanvasFEDisplacementMap::xChannelSelector):
        (WebCore::KCanvasFEDisplacementMap::setXChannelSelector):
        (WebCore::KCanvasFEDisplacementMap::yChannelSelector):
        (WebCore::KCanvasFEDisplacementMap::setYChannelSelector):
        (WebCore::KCanvasFEDisplacementMap::scale):
        (WebCore::KCanvasFEDisplacementMap::setScale):
        * kcanvas/device/quartz/KCanvasFilterQuartz.h:
        * kcanvas/device/quartz/KCanvasFilterQuartz.mm:
        (WebCore::getVectorForChannel):
        (WebCore::KCanvasFEDisplacementMapQuartz::getCIFilter):
        * kcanvas/device/quartz/KRenderingDeviceQuartz.mm:
        (WebCore::KRenderingDeviceQuartz::createFilterEffect):
        * kcanvas/device/quartz/filters/WKDisplacementMapFilter.cikernel: Added.
        * kcanvas/device/quartz/filters/WKDisplacementMapFilter.h: Added.
        * kcanvas/device/quartz/filters/WKDisplacementMapFilter.m: Added.
        (+[WKDisplacementMapFilter initialize]):
        (+[WKDisplacementMapFilter filterWithName:]):
        (-[WKDisplacementMapFilter init]):
        (-[WKDisplacementMapFilter outputImage]):
        * ksvg2/svg/SVGFEDisplacementMapElementImpl.cpp: Added.
        (SVGFEDisplacementMapElementImpl::SVGFEDisplacementMapElementImpl):
        (SVGFEDisplacementMapElementImpl::~SVGFEDisplacementMapElementImpl):
        (SVGFEDisplacementMapElementImpl::in1):
        (SVGFEDisplacementMapElementImpl::in2):
        (SVGFEDisplacementMapElementImpl::xChannelSelector):
        (SVGFEDisplacementMapElementImpl::yChannelSelector):
        (SVGFEDisplacementMapElementImpl::scale):
        (SVGFEDisplacementMapElementImpl::stringToChannel):
        (SVGFEDisplacementMapElementImpl::parseMappedAttribute):
        (SVGFEDisplacementMapElementImpl::filterEffect):
        * ksvg2/svg/SVGFEDisplacementMapElementImpl.h: Added.
        * ksvg2/svg/svgtags.in:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12819 268f45cc-cd09-0410-ab3c-d52691b4dbfc