Option Groups with display: none should not show the children option elements

Source/core/html/HTMLOptionElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility, Inc.  All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 379 matching lines @@
 }
 
 bool HTMLOptionElement::spatialNavigationFocused() const
 {
     HTMLSelectElement* select = ownerSelectElement();
     if (!select || !select->focused())
         return false;
     return select->spatialNavigationFocusedOption() == this;
 }
 
+bool HTMLOptionElement::isDisplayNone() const
+{
+    // If m_style is not set, then the node is still unattached.
+    // We have to wait till it gets attached to read the display property.
+    if (!m_style)
+        return false;
+
+    if (m_style->display() != NONE) {
+        Element* parent = parentElement();
+        ASSERT(parent);
+        if (isHTMLOptGroupElement(*parent)) {
+            RenderStyle* parentStyle = parent->renderStyle() ? parent->renderStyle() : parent->computedStyle();
+            return !parentStyle || parentStyle->display() == NONE;
+        }
+    }
+    return m_style->display() == NONE;
+}
+
 } // namespace blink