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

Source/core/svg/SVGStringListTearOff.h

Index: Source/core/svg/SVGStringListTearOff.h
diff --git a/Source/core/svg/SVGStringListTearOff.h b/Source/core/svg/SVGStringListTearOff.h
index 3e16f5c8154140d2af37d25e1c5ec241ba82ce4e..ed7419a339d3ab77b14c042e4dd3ab95db7f7313 100644
--- a/Source/core/svg/SVGStringListTearOff.h
+++ b/Source/core/svg/SVGStringListTearOff.h
@@ -46,9 +46,9 @@ public:
     // SVGStringList DOM interface:
 
     // WebIDL requires "unsigned long" type instead of size_t.
-    unsigned long numberOfItems()
+    unsigned long length()
     {
-        return target()->numberOfItems();
+        return target()->length();
     }
 
     void clear(ExceptionState& exceptionState)
@@ -106,6 +106,12 @@ public:
         return item;
     }
 
+    bool anonymousIndexedSetter(unsigned index, const String& item, ExceptionState& exceptionState)
+    {
+        replaceItem(item, index, exceptionState);
+        return true;
+    }
+
     String removeItem(unsigned long index, ExceptionState& exceptionState)
     {
         if (isImmutable()) {