Implemented IAccessible2 reverse relations.

third_party/WebKit/Source/modules/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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.
@@ skipping 791 matching lines @@
     // Returns 0-based index.
     int indexInParent() const;
 
     // Returns 1-based position in set.
     virtual int posInSet() const { return 0; }
     virtual int setSize() const { return 0; }
     bool supportsSetSizeAndPosInSet() const;
 
     // ARIA live-region features.
     bool isLiveRegion() const;
-    const AXObject* liveRegionRoot() const;
+    AXObject* liveRegionRoot() const;
     virtual const AtomicString& liveRegionStatus() const { return nullAtom; }
     virtual const AtomicString& liveRegionRelevant() const { return nullAtom; }
     virtual bool liveRegionAtomic() const { return false; }
     virtual bool liveRegionBusy() const { return false; }
 
     const AtomicString& containerLiveRegionStatus() const;
     const AtomicString& containerLiveRegionRelevant() const;
     bool containerLiveRegionAtomic() const;
     bool containerLiveRegionBusy() const;
 
@@ skipping 152 matching lines @@
     // are only valid if m_lastModificationCount matches AXObjectCacheImpl::modificationCount().
     mutable int m_lastModificationCount;
     mutable RGBA32 m_cachedBackgroundColor;
     mutable bool m_cachedIsIgnored : 1;
     mutable bool m_cachedIsInertOrAriaHidden : 1;
     mutable bool m_cachedIsDescendantOfLeafNode : 1;
     mutable bool m_cachedIsDescendantOfDisabledNode : 1;
     mutable bool m_cachedHasInheritedPresentationalRole : 1;
     mutable bool m_cachedIsPresentationalChild : 1;
     mutable bool m_cachedAncestorExposesActiveDescendant : 1;
-    mutable Member<const AXObject> m_cachedLiveRegionRoot;
+    mutable Member<AXObject> m_cachedLiveRegionRoot;
 
     Member<AXObjectCacheImpl> m_axObjectCache;
 
     // Updates the cached attribute values. This may be recursive, so to prevent deadlocks,
     // functions called here may only search up the tree (ancestors), not down.
     void updateCachedAttributeValuesIfNeeded() const;
 
 private:
     static bool includesARIAWidgetRole(const String&);
     static bool hasInteractiveARIAAttribute(const Element&);
 
     static unsigned s_numberOfLiveAXObjects;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 #endif // AXObject_h