Updated SVGListPropertyHelper as per SVG2 Spec

Source/core/svg/SVGPathSegListTearOff.h

Index: Source/core/svg/SVGPathSegListTearOff.h
diff --git a/Source/core/svg/SVGPathSegListTearOff.h b/Source/core/svg/SVGPathSegListTearOff.h
index b95e6b20a6657d40b87fad6d2deaf47eeff7c76b..6c5b6ecd3ef22e5ea2f8762b3b5ca2fb1aa9a351 100644
--- a/Source/core/svg/SVGPathSegListTearOff.h
+++ b/Source/core/svg/SVGPathSegListTearOff.h
@@ -48,6 +48,12 @@ public:
     {
         ASSERT(attributeName == SVGNames::dAttr);
         RefPtrWillBeRawPtr<ItemTearOffType> newItem = passNewItem;
+
+        // SVG2-Draft Spec: If newItem is already in a list, then a new object is created with the same values as newItem and this item is inserted into the list.

[fs, 2015/06/17 16:02:05]

I think I would prefer just "Spec" here, you can drop a spec-link in here though
to show more specifically.

[Shanmuga Pandi, 2015/06/18 11:30:45]

Done.

+        // Otherwise, newItem itself is inserted into the list.
+        if (newItem->ownerList())
+            newItem = newItem->clone();
+
         newItem->setContextElement(contextElement);
         return newItem.release();
     }