Improved the reporting of background color information.

third_party/WebKit/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 494 matching lines @@
 {
     if (isDetached())
         return;
 
     AXObjectCacheImpl& cache = axObjectCache();
 
     if (cache.modificationCount() == m_lastModificationCount)
         return;
 
     m_lastModificationCount = cache.modificationCount();
+    m_cachedBackgroundColor = computeBackgroundColor();
     m_cachedIsInertOrAriaHidden = computeIsInertOrAriaHidden();
     m_cachedIsDescendantOfLeafNode = (leafNodeAncestor() != 0);
     m_cachedIsDescendantOfDisabledNode = (disabledAncestor() != 0);
     m_cachedHasInheritedPresentationalRole = (inheritsPresentationalRoleFrom() != 0);
     m_cachedIsPresentationalChild = (ancestorForWhichThisIsAPresentationalChild() != 0);
     m_cachedIsIgnored = computeAccessibilityIsIgnored();
     m_cachedLiveRegionRoot = isLiveRegion() ?
         this :
         (parentObjectIfExists() ? parentObjectIfExists()->liveRegionRoot() : 0);
     m_cachedAncestorExposesActiveDescendant = computeAncestorExposesActiveDescendant();
@@ skipping 392 matching lines @@
 }
 
 String AXObject::textFromAriaDescribedby(AXRelatedObjectVector* relatedObjects) const
 {
     AXObjectSet visited;
     HeapVector<Member<Element>> elements;
     elementsFromAttribute(elements, aria_describedbyAttr);
     return textFromElements(true, visited, elements, relatedObjects);
 }
 
+RGBA32 AXObject::backgroundColor() const
+{
+    updateCachedAttributeValuesIfNeeded();
+    return m_cachedBackgroundColor;
+}
+
 AccessibilityOrientation AXObject::orientation() const
 {
     // In ARIA 1.1, the default value for aria-orientation changed from
     // horizontal to undefined.
     return AccessibilityOrientationUndefined;
 }
 
 static String queryString(WebLocalizedString::Name name)
 {
     return Locale::defaultLocale().queryString(name);
@@ skipping 794 matching lines @@
 
 DEFINE_TRACE(AXObject)
 {
     visitor->trace(m_children);
     visitor->trace(m_parent);
     visitor->trace(m_cachedLiveRegionRoot);
     visitor->trace(m_axObjectCache);
 }
 
 } // namespace blink