Fire accessibility hover events when the touch exploration flag is set.

third_party/WebKit/Source/core/dom/AXObjectCache.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 44 matching lines @@
     enum AXNotification {
         AXActiveDescendantChanged,
         AXAlert,
         AXAriaAttributeChanged,
         AXAutocorrectionOccured,
         AXBlur,
         AXCheckedStateChanged,
         AXChildrenChanged,
         AXFocusedUIElementChanged,
         AXHide,
+        AXHover,
         AXInvalidStatusChanged,
         AXLayoutComplete,
         AXLiveRegionChanged,
         AXLoadComplete,
         AXLocationChanged,
         AXMenuListItemSelected,
         AXMenuListItemUnselected,
         AXMenuListValueChanged,
         AXRowCollapsed,
         AXRowCountChanged,
@@ skipping 53 matching lines @@
     virtual void handleScrollPositionChanged(LayoutObject*) = 0;
 
     // Called when scroll bars are added / removed (as the view resizes).
     virtual void handleScrollbarUpdate(FrameView*) = 0;
     virtual void handleLayoutComplete(LayoutObject*) = 0;
     virtual void handleScrolledToAnchor(const Node* anchorNode) = 0;
 
     virtual const AtomicString& computedRoleForNode(Node*) = 0;
     virtual String computedNameForNode(Node*) = 0;
 
+    virtual void onTouchAccessibilityHover(const IntPoint&) = 0;
+
     typedef AXObjectCache* (*AXObjectCacheCreateFunction)(Document&);
     static void init(AXObjectCacheCreateFunction);
 
 protected:
     AXObjectCache();
 
 private:
     static AXObjectCacheCreateFunction m_createFunction;
 };
 
 class CORE_EXPORT ScopedAXObjectCache {
     WTF_MAKE_FAST_ALLOCATED(ScopedAXObjectCache);
     WTF_MAKE_NONCOPYABLE(ScopedAXObjectCache);
 public:
     static PassOwnPtr<ScopedAXObjectCache> create(Document&);
     ~ScopedAXObjectCache();
 
     AXObjectCache* get();
 
 private:
     explicit ScopedAXObjectCache(Document&);
 
     RefPtrWillBePersistent<Document> m_document;
     Persistent<AXObjectCache> m_cache;
 };
 
 }
 
 #endif