Implement the inert attribute

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

Index: third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
index 9676ad9ddce2b7ee4894c6e2e4d40f6a32c96037..50d3926738224b68a61044cfc0fcd874c4b0a8be 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
@@ -26,7 +26,9 @@
 #include "modules/accessibility/AXMenuListOption.h"
 
 #include "SkMatrix44.h"
+#include "base/debug/stack_trace.h"
 #include "core/dom/AccessibleNode.h"
+#include "core/html/HTMLSelectElement.h"
 #include "modules/accessibility/AXMenuListPopup.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 
@@ -36,7 +38,13 @@ using namespace HTMLNames;
 
 AXMenuListOption::AXMenuListOption(HTMLOptionElement* element,
                                    AXObjectCacheImpl& ax_object_cache)
-    : AXMockObject(ax_object_cache), element_(element) {}
+    : AXMockObject(ax_object_cache), element_(element) {
+  LOG(INFO) << "this " << this << "; element " << element
+            << " textContent:" << element->textContent().Utf8().data()
+            << "; trace: ";
+  base::debug::StackTrace trace;
+  trace.Print();
+}
 
 AXMenuListOption::~AXMenuListOption() {
   DCHECK(!element_);
@@ -63,6 +71,33 @@ Element* AXMenuListOption::ActionElement() const {
   return element_;
 }
 
+AXObject* AXMenuListOption::ComputeParent() const {
+  LOG(INFO) << "ComputeParent for MenuListOption " << this;
+  Node* node = GetNode();
+  if (!node) {
+    LOG(INFO) << "!node";
+    return nullptr;
+  }
+  HTMLSelectElement* select = toHTMLOptionElement(node)->OwnerSelectElement();
+  if (!select) {
+    LOG(INFO) << "!select";
+    return nullptr;
+  }
+  LOG(INFO) << "Found select";
+  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();
+  }
+  LOG(INFO) << "Returning parent_.Get(): " << parent_.Get();
+  return parent_.Get();
+}
+
 bool AXMenuListOption::IsEnabled() const {
   // isDisabledFormControl() returns true if the parent <select> element is
   // disabled, which we don't want.