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

Source/core/svg/properties/NewSVGListPropertyTearOffHelper.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 63 matching lines @@
 class NewSVGListPropertyTearOffHelper : public NewSVGPropertyTearOff<ListProperty> {
 public:
     typedef ListProperty ListPropertyType;
     typedef typename ListPropertyType::ItemPropertyType ItemPropertyType;
     typedef typename ItemPropertyType::TearOffType ItemTearOffType;
     typedef ListItemPropertyTraits<ItemPropertyType> ItemTraits;
 
     // 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)
     {
         if (toDerived()->isImmutable()) {
             exceptionState.throwDOMException(NoModificationAllowedError, "The object is read-only.");
             return;
         }
 
         toDerived()->target()->clear();
@@ skipping 58 matching lines @@
             exceptionState.throwTypeError("An invalid item cannot be replaced with an existing list item.");
             return nullptr;
         }
 
         RefPtr<ItemPropertyType> value = toDerived()->target()->replaceItem(getValueForInsertionFromTearOff(item), index, exceptionState);
         toDerived()->commitChange();
 
         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);
         toDerived()->commitChange();
 
         return createItemTearOff(value.release());
     }
 
     PassRefPtr<ItemTearOffType> appendItem(PassRefPtr<ItemTearOffType> passItem, ExceptionState& exceptionState)
     {
@@ skipping 34 matching lines @@
         return ItemTraits::createTearOff(value, toDerived()->contextElement(), toDerived()->propertyIsAnimVal(), toDerived()->attributeName());
     }
 
 private:
     Derived* toDerived() { return static_cast<Derived*>(this); }
 };
 
 }
 
 #endif // NewSVGListPropertyTearOffHelper_h