Reviewed by Kenneth Rohde Christiansen.

        Added test for basic msubsup support.

        * mathml/presentation/subsup.xhtml: Added.
        * platform/mac/mathml/presentation/subsup-expected.checksum: Added.
        * platform/mac/mathml/presentation/subsup-expected.png: Added.
        * platform/mac/mathml/presentation/subsup-expected.txt: Added.
2010-03-01  Alex Milowski  <alex@milowski.com>

        Reviewed by Kenneth Rohde Christiansen.

        Added support for the msubsup element that also handles the msup and msub elements.

        Test: mathml/presentation/subsup.xhtml

        * WebCore.xcodeproj/project.pbxproj:
        * mathml/MathMLInlineContainerElement.cpp:
        (WebCore::MathMLInlineContainerElement::createRenderer):
        * mathml/RenderMathMLSubSup.cpp: Added.
        (WebCore::RenderMathMLSubSup::RenderMathMLSubSup):
        (WebCore::RenderMathMLSubSup::addChild):
        (WebCore::RenderMathMLSubSup::stretchToHeight):
        (WebCore::RenderMathMLSubSup::nonOperatorHeight):
        (WebCore::RenderMathMLSubSup::layout):
        (WebCore::RenderMathMLSubSup::baselinePosition):
        * mathml/RenderMathMLSubSup.h: Added.
        (WebCore::RenderMathMLSubSup::hasBase):
        (WebCore::RenderMathMLSubSup::):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55386 268f45cc-cd09-0410-ab3c-d52691b4dbfc