[SVG2] Add support for marker orient="auto-start-reverse".

Source/core/rendering/svg/SVGRenderTreeAsText.cpp

Index: Source/core/rendering/svg/SVGRenderTreeAsText.cpp
diff --git a/Source/core/rendering/svg/SVGRenderTreeAsText.cpp b/Source/core/rendering/svg/SVGRenderTreeAsText.cpp
index 0966adfb7e491c2c4ac2cee9f912c4251f694bc4..bcc3e8cc47ee04b50e2a65aad5d921ae7e1df072 100644
--- a/Source/core/rendering/svg/SVGRenderTreeAsText.cpp
+++ b/Source/core/rendering/svg/SVGRenderTreeAsText.cpp
@@ -186,6 +186,12 @@ static TextStream& operator<<(TextStream& ts, const SVGMarkerUnitsType& markerUn
     return ts;
 }
 
+static TextStream& operator<<(TextStream& ts, const SVGMarkerOrientType& orientType)
+{
+    ts << SVGEnumerationToString<SVGMarkerOrientType>(orientType);
+    return ts;
+}
+
 TextStream& operator<<(TextStream& ts, const Color& c)
 {
     return ts << c.nameForRenderTreeAsText();
@@ -526,7 +532,7 @@ void writeSVGResourceContainer(TextStream& ts, const RenderObject& object, int i
         ts << " [ref at " << marker->referencePoint() << "]";
         ts << " [angle=";
         if (marker->angle() == -1)
-            ts << "auto" << "]\n";
+            ts << marker->orientType() << "]\n";
         else
             ts << marker->angle() << "]\n";
     } else if (resource->resourceType() == PatternResourceType) {