Convert stroke thickness to a float.  This allows the thickness argument to strokeArc to be eliminated.
       
        Reviewed by olliej

        * platform/graphics/GraphicsContext.cpp:
        (WebCore::GraphicsContext::setStrokeThickness):
        (WebCore::GraphicsContext::strokeThickness):
        (WebCore::GraphicsContext::setPlatformStrokeThickness):
        * platform/graphics/GraphicsContext.h:
        * platform/graphics/cg/GraphicsContextCG.cpp:
        (WebCore::GraphicsContext::drawEllipse):
        (WebCore::GraphicsContext::strokeArc):
        * platform/graphics/qt/GraphicsContextQt.cpp:
        (WebCore::GraphicsContext::strokeArc):
        (WebCore::GraphicsContext::setPlatformStrokeThickness):
        * rendering/RenderObject.cpp:
        (WebCore::RenderObject::drawBorderArc):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@18306 268f45cc-cd09-0410-ab3c-d52691b4dbfc