Support 'paint-order' from SVG2.

Source/core/rendering/style/SVGRenderStyleDefs.h

Index: Source/core/rendering/style/SVGRenderStyleDefs.h
diff --git a/Source/core/rendering/style/SVGRenderStyleDefs.h b/Source/core/rendering/style/SVGRenderStyleDefs.h
index 4f9d706d3347a1d3f714e77c7f5b9aa772574ea8..92b1b3d5c5fb45fa17b20c32c57788e0485cab02 100644
--- a/Source/core/rendering/style/SVGRenderStyleDefs.h
+++ b/Source/core/rendering/style/SVGRenderStyleDefs.h
@@ -93,6 +93,17 @@ namespace WebCore {
         MT_ALPHA
     };
 
+    enum EPaintOrderType {
+        PT_NONE    = 0,
+        PT_FILL    = 1,
+        PT_STROKE  = 2,
+        PT_MARKERS = 3
+    };
+
+    const int kPaintOrderBitwidth = 2;
+    typedef unsigned EPaintOrder;
+    const unsigned PO_NORMAL = PT_FILL | PT_STROKE << 2 | PT_MARKERS << 4;
+
     class CSSValue;
     class CSSValueList;
     class SVGPaint;