Support 'paint-order' from SVG2.

Source/core/css/SVGCSSComputedStyleDeclaration.cpp

 /*
     Copyright (C) 2007 Eric Seidel <eric@webkit.org>
     Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
@@ skipping 174 matching lines @@
             if (RefPtr<CSSPrimitiveValue> value = glyphOrientationToCSSPrimitiveValue(svgStyle->glyphOrientationVertical()))
                 return value.release();
 
             if (svgStyle->glyphOrientationVertical() == GO_AUTO)
                 return CSSPrimitiveValue::createIdentifier(CSSValueAuto);
 
             return 0;
         }
         case CSSPropertyWebkitSvgShadow:
             return valueForShadow(svgStyle->shadow(), propertyID, style);
+        case CSSPropertyPaintOrder:
+            return CSSPrimitiveValue::create(svgStyle->paintOrder());
         case CSSPropertyVectorEffect:
             return CSSPrimitiveValue::create(svgStyle->vectorEffect());
         case CSSPropertyMaskType:
             return CSSPrimitiveValue::create(svgStyle->maskType());
         case CSSPropertyMarker:
         case CSSPropertyEnableBackground:
         case CSSPropertyColorProfile:
             // the above properties are not yet implemented in the engine
             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 CSSComputedStyleDelcaration::getPropertyCSSValue
         ASSERT_WITH_MESSAGE(0, "unimplemented propertyID: %d", propertyID);
     }
     LOG_ERROR("unimplemented propertyID: %d", propertyID);
     return 0;
 }
 
 }
 
 #endif // ENABLE(SVG)
 
 // vim:ts=4:noet