Implement the inert attribute

third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp

 /*
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 #include "modules/accessibility/AXMenuListOption.h"
 
 #include "SkMatrix44.h"
 #include "core/dom/AccessibleNode.h"
+#include "core/html/HTMLSelectElement.h"
 #include "modules/accessibility/AXMenuListPopup.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 AXMenuListOption::AXMenuListOption(HTMLOptionElement* element,
                                    AXObjectCacheImpl& ax_object_cache)
     : AXMockObject(ax_object_cache), element_(element) {}
@@ skipping 16 matching lines @@
   AccessibilityRole role = AriaRoleToWebCoreRole(aria_role);
   if (role)
     return role;
   return kMenuListOptionRole;
 }
 
 Element* AXMenuListOption::ActionElement() const {
   return element_;
 }
 
+AXObject* AXMenuListOption::ComputeParent() const {
+  Node* node = GetNode();
+  if (!node)
+    return nullptr;
+  HTMLSelectElement* select = toHTMLOptionElement(node)->OwnerSelectElement();
+  if (!select)
+    return nullptr;
+  AXObject* select_ax_object = AxObjectCache().GetOrCreate(select);
+  if (select_ax_object->HasChildren()) {
+    const auto& child_objects = select_ax_object->Children();
+    DCHECK(!child_objects.IsEmpty());
+    DCHECK_EQ(child_objects.size(), 1UL);
+    DCHECK(child_objects[0]->IsMenuListPopup());
+    ToAXMenuListPopup(child_objects[0].Get())->UpdateChildrenIfNecessary();
+  } else {
+    select_ax_object->UpdateChildrenIfNecessary();
+  }
+  return parent_.Get();
+}
+
 bool AXMenuListOption::IsEnabled() const {
   // isDisabledFormControl() returns true if the parent <select> element is
   // disabled, which we don't want.
   return element_ && !element_->OwnElementDisabled();
 }
 
 bool AXMenuListOption::IsVisible() const {
   if (!parent_)
     return false;
 
@@ skipping 83 matching lines @@
 
   return text_alternative;
 }
 
 DEFINE_TRACE(AXMenuListOption) {
   visitor->Trace(element_);
   AXMockObject::Trace(visitor);
 }
 
 }  // namespace blink