Aria disabled does not apply to descendant 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_id(0)
     , 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_cachedLiveRegionRoot(0)
     , m_axObjectCache(axObjectCache)
 {
 }
 
 AXObject::~AXObject()
 {
     ASSERT(isDetached());
 }
 
@@ skipping 115 matching lines @@
     AXObjectCacheImpl* cache = axObjectCache();
     if (!cache)
         return;
 
     if (cache->modificationCount() == m_lastModificationCount)
         return;
 
     m_lastModificationCount = cache->modificationCount();
     m_cachedIsInertOrAriaHidden = computeIsInertOrAriaHidden();
     m_cachedIsDescendantOfBarrenParent = computeIsDescendantOfBarrenParent();
+    m_cachedIsDescendantOfDisabledNode = computeIsDescendantOfDisabledNode();
     m_cachedIsIgnored = computeAccessibilityIsIgnored();
     m_cachedLiveRegionRoot = isLiveRegion() ?
         this :
         (parentObjectIfExists() ? parentObjectIfExists()->liveRegionRoot() : 0);
 }
 
 bool AXObject::accessibilityIsIgnoredByDefault() const
 {
     return defaultObjectInclusion() == IgnoreObject;
 }
@@ skipping 56 matching lines @@
 const AXObject* AXObject::ariaHiddenRoot() const
 {
     for (const AXObject* object = this; object; object = object->parentObject()) {
         if (equalIgnoringCase(object->getAttribute(aria_hiddenAttr), "true"))
             return object;
     }
 
     return 0;
 }
 
+bool AXObject::isDescendantOfDisabledNode() const
+{
+    updateCachedAttributeValuesIfNeeded();
+    return m_cachedIsDescendantOfDisabledNode;
+}
+
+bool AXObject::computeIsDescendantOfDisabledNode() const
+{
+    const AtomicString& disabled = getAttribute(aria_disabledAttr);
+    if (equalIgnoringCase(disabled, "true"))
+        return true;
+    if (equalIgnoringCase(disabled, "false"))
+        return false;
+
+    if (AXObject* parent = parentObject())
+        return parent->isDescendantOfDisabledNode();
+
+    return false;
+}
+
 bool AXObject::lastKnownIsIgnoredValue()
 {
     if (m_lastKnownIsIgnoredValue == DefaultBehavior)
         m_lastKnownIsIgnoredValue = accessibilityIsIgnored() ? IgnoreObject : IncludeObject;
 
     return m_lastKnownIsIgnoredValue == IgnoreObject;
 }
 
 void AXObject::setLastKnownIsIgnoredValue(bool isIgnored)
 {
@@ skipping 661 matching lines @@
 }
 
 const AtomicString& AXObject::roleName(AccessibilityRole role)
 {
     static const Vector<AtomicString>* roleNameVector = createRoleNameVector();
 
     return roleNameVector->at(role);
 }
 
 } // namespace blink