[SVG2] Add getters and setters to SVG*List interfaces.

Source/core/svg/properties/NewSVGListPropertyTearOffHelper.h

Index: Source/core/svg/properties/NewSVGListPropertyTearOffHelper.h
diff --git a/Source/core/svg/properties/NewSVGListPropertyTearOffHelper.h b/Source/core/svg/properties/NewSVGListPropertyTearOffHelper.h
index de7d151104a266b4c50b5ecd7a80ac7650dcdccb..1cdc50cea5e8f26762b293bdb28c98a15d1d491a 100644
--- a/Source/core/svg/properties/NewSVGListPropertyTearOffHelper.h
+++ b/Source/core/svg/properties/NewSVGListPropertyTearOffHelper.h
@@ -81,9 +81,9 @@ public:
     // SVG*List DOM interface:
 
     // WebIDL requires "unsigned long" type instead of size_t.
-    unsigned long numberOfItems()
+    unsigned long length()
     {
-        return toDerived()->target()->numberOfItems();
+        return toDerived()->target()->length();
     }
 
     void clear(ExceptionState& exceptionState)
@@ -162,6 +162,12 @@ public:
         return createItemTearOff(value.release());
     }
 
+    bool anonymousIndexedSetter(unsigned index, PassRefPtr<ItemTearOffType> passItem, ExceptionState& exceptionState)
+    {
+        replaceItem(passItem, index, exceptionState);
+        return true;
+    }
+
     PassRefPtr<ItemTearOffType> removeItem(unsigned long index, ExceptionState& exceptionState)
     {
         RefPtr<ItemPropertyType> value = toDerived()->target()->removeItem(index, exceptionState);