Don't ignore landmark and related AXObjects, because they should be exposed to

Source/core/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 165 matching lines @@
     return ariaRoleAttribute() == TextAreaRole || ariaRoleAttribute() == TextFieldRole;
 }
 
 bool AXObject::isButton() const
 {
     AccessibilityRole role = roleValue();
 
     return role == ButtonRole || role == PopUpButtonRole || role == ToggleButtonRole;
 }
 
+bool AXObject::isLandmarkRelated() const
+{
+    switch (roleValue()) {
+    case ApplicationRole:
+    case ArticleRole:
+    case BannerRole:
+    case ComplementaryRole:
+    case ContentInfoRole:
+    case FooterRole:
+    case MainRole:
+    case NavigationRole:
+    case RegionRole:
+    case SearchRole:
+        return true;
+    default:
+        return false;
+    }
+}
+
 bool AXObject::isMenuRelated() const
 {
     switch (roleValue()) {
     case MenuRole:
     case MenuBarRole:
     case MenuButtonRole:
     case MenuItemRole:
         return true;
     default:
         return false;
@@ skipping 702 matching lines @@
         return ToggleButtonRole;
     if (ariaHasPopup())
         return PopUpButtonRole;
     // We don't contemplate RadioButtonRole, as it depends on the input
     // type.
 
     return ButtonRole;
 }
 
 } // namespace WebCore