AX presentation role should be inherited to its required owned elements.

Source/modules/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 218 matching lines @@
     , m_haveChildren(false)
     , m_role(UnknownRole)
     , m_lastKnownIsIgnoredValue(DefaultBehavior)
     , m_detached(false)
     , m_parent(0)
     , m_lastModificationCount(-1)
     , m_cachedIsIgnored(false)
     , m_cachedIsInertOrAriaHidden(false)
     , m_cachedIsDescendantOfBarrenParent(false)
     , m_cachedIsDescendantOfDisabledNode(false)
+    , m_cachedHasInheritedPresentationRole(false)
     , m_cachedLiveRegionRoot(0)
     , m_axObjectCache(axObjectCache)
 {
 }
 
 AXObject::~AXObject()
 {
     ASSERT(isDetached());
 }
 
@@ skipping 114 matching lines @@
     if (!cache)
         return;
 
     if (cache->modificationCount() == m_lastModificationCount)
         return;
 
     m_lastModificationCount = cache->modificationCount();
     m_cachedIsInertOrAriaHidden = computeIsInertOrAriaHidden();
     m_cachedIsDescendantOfBarrenParent = computeIsDescendantOfBarrenParent();
     m_cachedIsDescendantOfDisabledNode = computeIsDescendantOfDisabledNode();
+    m_cachedHasInheritedPresentationRole = computeHasInheritedPresentationRole();
     m_cachedIsIgnored = computeAccessibilityIsIgnored();
     m_cachedLiveRegionRoot = isLiveRegion() ?
         this :
         (parentObjectIfExists() ? parentObjectIfExists()->liveRegionRoot() : 0);
 }
 
 bool AXObject::accessibilityIsIgnoredByDefault() const
 {
     return defaultObjectInclusion() == IgnoreObject;
 }
@@ skipping 769 matching lines @@
 }
 
 const AtomicString& AXObject::roleName(AccessibilityRole role)
 {
     static const Vector<AtomicString>* roleNameVector = createRoleNameVector();
 
     return roleNameVector->at(role);
 }
 
 } // namespace blink