Support indexed setter generation

Source/core/html/HTMLOptionsCollection.cpp

Index: Source/core/html/HTMLOptionsCollection.cpp
diff --git a/Source/core/html/HTMLOptionsCollection.cpp b/Source/core/html/HTMLOptionsCollection.cpp
index 276590550ccdf0fbf21706359514b21143a378cc..07ed04e9457ed57e2cb5a5856289dcafa4a56cd7 100644
--- a/Source/core/html/HTMLOptionsCollection.cpp
+++ b/Source/core/html/HTMLOptionsCollection.cpp
@@ -108,4 +108,21 @@ void HTMLOptionsCollection::anonymousNamedGetter(const AtomicString& name, bool&
     returnValue0 = NamedNodesCollection::create(namedItems);
 }
 
+bool HTMLOptionsCollection::anonymousIndexedSetter(unsigned index, PassRefPtr<HTMLOptionElement> value, bool isValueNull, bool isValueUndefined, ExceptionCode& ec)
+{
+    HTMLSelectElement* base = toHTMLSelectElement(ownerNode());
+    if (isValueNull || isValueUndefined) {
+        base->remove(index);
+        return true;
+    }
+    if (!value) {
+        ec = TYPE_MISMATCH_ERR;
+        return true;
+    }
+    base->setOption(index, value.get(), ec);
+    return true;
+}
+
 } //namespace
+
+