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..d25fca17a50235dd0d219912416e1c48ca988cc1 100644
--- a/Source/modules/accessibility/AXListBoxOption.cpp
+++ b/Source/modules/accessibility/AXListBoxOption.cpp
@@ -58,9 +58,36 @@ 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;
+
+    LayoutObject* layoutObject = parent->layoutObject();
+    if (!layoutObject)
+        return false;
+
+    if (layoutObject->isListBox() && (parent->isPresentation() || parent->hasInheritedPresentationRole()))

[dmazzoni, 2015/04/01 15:27:55]

Do you need both isPresentation and hasInheritedPresentationRole?

I thought hasInheritedPresentationRole will return true if the role is
presentation.

[je_julie(Not used), 2015/04/02 05:51:28]

Yes. you're right. Done.

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