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

Source/modules/accessibility/AXListBoxOption.cpp

Index: Source/modules/accessibility/AXListBoxOption.cpp
diff --git a/Source/modules/accessibility/AXListBoxOption.cpp b/Source/modules/accessibility/AXListBoxOption.cpp
index 58a91d3a8961d74c081a87413373c69a193e9678..bf9f587692d36b4386bab86cfa3aab97967128ab 100644
--- a/Source/modules/accessibility/AXListBoxOption.cpp
+++ b/Source/modules/accessibility/AXListBoxOption.cpp
@@ -58,9 +58,37 @@ AccessibilityRole AXListBoxOption::roleValue() const
     AccessibilityRole ariaRole = ariaRoleAttribute();
     if (ariaRole != UnknownRole)
         return ariaRole;
+
+    // Generally, the presentation role is handled in computeAccessibilityIsIgnored().
+    // In case of ListBoxOption, if it just marked as ignored in computeAccessibilityIsIgnored(),
+    // we can't see listboxoption on tree without any text.
+    // http://www.w3.org/TR/wai-aria/complete#presentation
+    // ARIA spec says that the presentation role causes a given element to be treated
+    // as having no role or to be removed from the accessibility tree, but does not cause the
+    // content contained within the element to be removed from the accessibility tree.
+    if (isParentPresentationRole())
+        return StaticTextRole;
+
     return ListBoxOptionRole;
 }
 
+bool AXListBoxOption::isParentPresentationRole() const
+{
+    AXObject* parent = parentObject();
+    if (!parent)
+        return false;
+
+    // The parent should be a listbox in order to be Required Owned Elements and
+    // have a presentation role.
+    Node* parentNode = parent->node();
+    if (isHTMLSelectElement(parentNode)) {
+        HTMLSelectElement& selectElement = toHTMLSelectElement(*parentNode);
+        if (selectElement.multiple() && isPresentationRole(parent))

[dmazzoni, 2015/03/31 16:35:23]

selectElement.multiple() isn't the same as a select element being a listbox vs a
menulist, because <select size=5> also looks like a listbox.

Also note that on some platforms the logic may be different - for example on
Android a select element is always a menu list.

The best check is to get the layoutObject and check layoutObject->isListBox()

[je_julie(Not used), 2015/04/01 12:51:28]

I updated it with layoutObject->isListBox().

+            return true;
+    }
+    return false;
+}
+
 bool AXListBoxOption::isEnabled() const
 {
     if (!node())