AX presentation role should be inherited to its required owned elements.

Source/modules/accessibility/AXListBoxOption.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 40 matching lines @@
 PassRefPtr<AXListBoxOption> AXListBoxOption::create(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
 {
     return adoptRef(new AXListBoxOption(layoutObject, axObjectCache));
 }
 
 AccessibilityRole AXListBoxOption::roleValue() const
 {
     AccessibilityRole ariaRole = ariaRoleAttribute();
     if (ariaRole != UnknownRole)
         return ariaRole;
+
+    // This is for handling presentation Role.
+    // Currently IE handles presentation role correctly with OptionElement.

[dmazzoni, 2015/03/29 07:46:22]

I'd leave out this comment on IE unless the only reason we're doing something is
for IE compatibility. If our implementation is correct according to the spec,
let's just talk about the spec.

[je_julie(Not used), 2015/03/31 16:14:27]

I replaced the comment with the spec description.

+    // It doesn't ignore tree but handles it with Static Text Role.
+    // That's why it's handled in roleValue(), not in computeAccessibilityIsIgnored()
+    if (isParentPresentationRole())
+        return StaticTextRole;
+
     return ListBoxOptionRole;
 }
 
+bool AXListBoxOption::isParentPresentationRole() const
+{
+    AXObject* parent = parentObject();
+    if (!parent)
+        return false;
+
+    Node* parentNode = parent->node();
+    if (isHTMLSelectElement(parentNode)) {
+        HTMLSelectElement& selectElement = toHTMLSelectElement(*parentNode);
+        if (selectElement.multiple() && isPresentationRole(parent))
+            return true;
+    }
+    return false;
+}
+
 bool AXListBoxOption::isEnabled() const
 {
     if (!node())
         return false;
 
     if (equalIgnoringCase(getAttribute(aria_disabledAttr), "true"))
         return false;
 
     if (toElement(node())->hasAttribute(disabledAttr))
         return false;
@@ skipping 95 matching lines @@
     unsigned length = listItems.size();
     for (unsigned i = 0; i < length; i++) {
         if (listItems[i] == node())
             return i;
     }
 
     return -1;
 }
 
 } // namespace blink