Move more code into SVGRenderBase
        https://bugs.webkit.org/show_bug.cgi?id=25532

        clippedOverflowRectForRepaint, computeRectForRepaint and mapLocalToContainer
        are now all shared via SVGRenderBase.

        RenderForeignObject should also be sharing this code, but I've left it
        alone for now, as changing that would likely cause test changes.

        No test changes.  It's possible that transformed <svg:image> elements will
        now show up with better metrics in the inspector.

        * rendering/RenderSVGImage.cpp:
        (WebCore::RenderSVGImage::clippedOverflowRectForRepaint):
        (WebCore::RenderSVGImage::computeRectForRepaint):
        (WebCore::RenderSVGImage::mapLocalToContainer):
        * rendering/RenderSVGImage.h:
        * rendering/RenderSVGModelObject.cpp:
        (WebCore::RenderSVGModelObject::clippedOverflowRectForRepaint):
        (WebCore::RenderSVGModelObject::computeRectForRepaint):
        (WebCore::RenderSVGModelObject::mapLocalToContainer):
        * rendering/RenderSVGText.cpp:
        (WebCore::RenderSVGText::clippedOverflowRectForRepaint):
        (WebCore::RenderSVGText::computeRectForRepaint):
        (WebCore::RenderSVGText::mapLocalToContainer):
        * rendering/SVGRenderSupport.cpp:
        (WebCore::SVGRenderBase::clippedOverflowRectForRepaint):
        (WebCore::SVGRenderBase::computeRectForRepaint):
        (WebCore::SVGRenderBase::mapLocalToContainer):
        * rendering/SVGRenderSupport.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43210 268f45cc-cd09-0410-ab3c-d52691b4dbfc