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

third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp

 /*
  * Copyright (C) 2014, Google 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 1315 matching lines @@
     if (isHTMLInputElement(node)) {
         HTMLInputElement* element = toHTMLInputElement(node);
         placeholder = element->strippedPlaceholder();
         if (!placeholder.isEmpty())
             return placeholder;
     }
 
     return String();
 }
 
+void AXObjectCacheImpl::onTouchAccessibilityHover(const IntPoint& location)
+{
+    AXObject* hit = root()->accessibilityHitTest(location);
+    if (hit)
+        postPlatformNotification(hit, AXHover);
+}
+
 void AXObjectCacheImpl::setCanvasObjectBounds(Element* element, const LayoutRect& rect)
 {
     AXObject* obj = getOrCreate(element);
     if (!obj)
         return;
 
     obj->setElementRect(rect);
 }
 
 DEFINE_TRACE(AXObjectCacheImpl)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_document);
     visitor->trace(m_widgetObjectMapping);
     visitor->trace(m_nodeObjectMapping);
 #endif
 
     visitor->trace(m_objects);
     visitor->trace(m_notificationsToPost);
 
     AXObjectCache::trace(visitor);
 }
 
 } // namespace blink