Implement <select> Popup Menu using PagePopup

Source/core/html/HTMLOptionElement.cpp

Index: Source/core/html/HTMLOptionElement.cpp
diff --git a/Source/core/html/HTMLOptionElement.cpp b/Source/core/html/HTMLOptionElement.cpp
index 90a3895b670fb248d30a38285853dbce40a046f8..64f4dd781cd37c08ed0e0d94111c7f5a74ca23a9 100644
--- a/Source/core/html/HTMLOptionElement.cpp
+++ b/Source/core/html/HTMLOptionElement.cpp
@@ -172,6 +172,15 @@ int HTMLOptionElement::index() const
     return 0;
 }
 
+int HTMLOptionElement::listIndex() const
+{
+    HTMLSelectElement* selectElement = ownerSelectElement();
+    if (!selectElement)
+        return -1;
+
+    return selectElement->listIndexForOption(*this);
+}
+
 void HTMLOptionElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == valueAttr) {