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..f450328eeab67642bf32845c88ef392982a65305 100644
--- a/Source/modules/accessibility/AXListBoxOption.cpp
+++ b/Source/modules/accessibility/AXListBoxOption.cpp
@@ -58,9 +58,32 @@ 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())