Fire AX notifications on list box options.

Source/modules/accessibility/AXObjectCacheImpl.cpp

Index: Source/modules/accessibility/AXObjectCacheImpl.cpp
diff --git a/Source/modules/accessibility/AXObjectCacheImpl.cpp b/Source/modules/accessibility/AXObjectCacheImpl.cpp
index 47e682327e3cefda1c7c49d26d45ac68e9ec2e56..f5d5952bd8b057b1a634ec5820be6b986ba7ed59 100644
--- a/Source/modules/accessibility/AXObjectCacheImpl.cpp
+++ b/Source/modules/accessibility/AXObjectCacheImpl.cpp
@@ -39,6 +39,8 @@
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLLabelElement.h"
+#include "core/html/HTMLOptionElement.h"
+#include "core/html/HTMLSelectElement.h"
 #include "core/layout/LayoutListBox.h"
 #include "core/layout/LayoutMenuList.h"
 #include "core/layout/LayoutProgress.h"
@@ -778,18 +780,23 @@ void AXObjectCacheImpl::checkedStateChanged(Node* node)
     postNotification(node, AXObjectCacheImpl::AXCheckedStateChanged, true);
 }
 
-void AXObjectCacheImpl::selectedChildrenChanged(Node* node)
+void AXObjectCacheImpl::listboxOptionStateChanged(HTMLOptionElement* option)
 {
-    // postToElement is false so that you can pass in any child of an element and it will go up the parent tree
-    // to find the container which should send out the notification.
-    postNotification(node, AXSelectedChildrenChanged, false);
+    postNotification(option, AXCheckedStateChanged);
 }
 
-void AXObjectCacheImpl::selectedChildrenChanged(LayoutObject* layoutObject)
+void AXObjectCacheImpl::listboxSelectedChildrenChanged(HTMLSelectElement* select)
 {
-    // postToElement is false so that you can pass in any child of an element and it will go up the parent tree
-    // to find the container which should send out the notification.
-    postNotification(layoutObject, AXSelectedChildrenChanged, false);
+    postNotification(select, AXSelectedChildrenChanged);
+}
+
+void AXObjectCacheImpl::listboxActiveIndexChanged(HTMLSelectElement* select)
+{
+    AXObject* obj = get(select);
+    if (!obj || !obj->isAXListBox())
+        return;
+
+    static_cast<AXListBox*>(obj)->activeIndexChanged();
 }
 
 void AXObjectCacheImpl::handleScrollbarUpdate(FrameView* view)
@@ -824,6 +831,19 @@ void AXObjectCacheImpl::handleAriaExpandedChange(Node* node)
         obj->handleAriaExpandedChanged();
 }
 
+void AXObjectCacheImpl::handleAriaSelectedChanged(Node* node)
+{
+    AXObject* obj = get(node);
+    if (!obj)
+        return;
+
+    postNotification(obj, AXCheckedStateChanged);
+
+    AXObject* listbox = obj->parentObjectUnignored();
+    if (listbox->roleValue() == ListBoxRole)
+        postNotification(listbox, AXSelectedChildrenChanged);
+}
+
 void AXObjectCacheImpl::handleActiveDescendantChanged(Node* node)
 {
     if (AXObject* obj = getOrCreate(node))
@@ -860,7 +880,7 @@ void AXObjectCacheImpl::handleAttributeChanged(const QualifiedName& attrName, El
     else if (attrName == aria_checkedAttr)
         checkedStateChanged(element);
     else if (attrName == aria_selectedAttr)
-        selectedChildrenChanged(element);
+        handleAriaSelectedChanged(element);
     else if (attrName == aria_expandedAttr)
         handleAriaExpandedChange(element);
     else if (attrName == aria_hiddenAttr)