Support 'paint-order' from SVG2.

Source/core/css/SVGCSSStyleSelector.cpp

Index: Source/core/css/SVGCSSStyleSelector.cpp
diff --git a/Source/core/css/SVGCSSStyleSelector.cpp b/Source/core/css/SVGCSSStyleSelector.cpp
index ace386b1d82f1836ba744f118f40f302e5a2f231..ffb9a22d366449045586d78106ac8b5b920581ab 100644
--- a/Source/core/css/SVGCSSStyleSelector.cpp
+++ b/Source/core/css/SVGCSSStyleSelector.cpp
@@ -98,6 +98,38 @@ static Color colorFromSVGColorCSSValue(SVGColor* svgColor, const Color& fgColor)
     return color;
 }
 
+static EPaintOrder paintOrderFlattened(CSSValue* cssPaintOrder)
+{
+    if (cssPaintOrder->isValueList()) {
+        int paintOrder = 0;
+        CSSValueListInspector iter(cssPaintOrder);
+        for (size_t i = 0; i < iter.length(); i++) {
+            CSSPrimitiveValue* value = static_cast<CSSPrimitiveValue*>(iter.item(i));
+
+            EPaintOrderType paintOrderType = PT_NONE;
+            switch (value->getIdent()) {
+            case CSSValueFill:
+                paintOrderType = PT_FILL;
+                break;
+            case CSSValueStroke:
+                paintOrderType = PT_STROKE;
+                break;
+            case CSSValueMarkers:
+                paintOrderType = PT_MARKERS;
+                break;
+            default:
+                ASSERT_NOT_REACHED();
+                break;
+            }
+
+            paintOrder |= (paintOrderType << kPaintOrderBitwidth*i);
+        }
+        return (EPaintOrder)paintOrder;
+    }
+
+    return PO_NORMAL;
+}
+
 void StyleResolver::applySVGProperty(CSSPropertyID id, CSSValue* value)
 {
     ASSERT(value);
@@ -600,6 +632,13 @@ void StyleResolver::applySVGProperty(CSSPropertyID id, CSSValue* value)
             svgstyle->setMaskType(*primitiveValue);
             break;
         }
+        case CSSPropertyPaintOrder: {
+            HANDLE_INHERIT_AND_INITIAL(paintOrder, PaintOrder)
+
+            svgstyle->setPaintOrder(paintOrderFlattened(value));
+
+            break;
+        }
         default:
             // If you crash here, it's because you added a css property and are not handling it
             // in either this switch statement or the one in StyleResolver::applyProperty