Reviewed by Dirk Schulze.

        [OpenVG] Add support for drawing text to PainterOpenVG
        https://bugs.webkit.org/show_bug.cgi?id=35581

        Doesn't come with any actual font classes, as OpenVG
        by itself doesn't provide any access to platform fonts
        but just the means to draw glyphs that have been loaded
        manually before.

        * platform/graphics/openvg/PainterOpenVG.cpp:
        (WebCore::PlatformPainterState::PlatformPainterState):
        (WebCore::PlatformPainterState::copyPaintState):
        (WebCore::PainterOpenVG::textDrawingMode):
        (WebCore::PainterOpenVG::setTextDrawingMode):
        (WebCore::PainterOpenVG::drawText):
        * platform/graphics/openvg/PainterOpenVG.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55923 268f45cc-cd09-0410-ab3c-d52691b4dbfc