Fix touch accessibility events in WebViews and iframes

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 1234 matching lines @@
     AXObject* obj = getOrCreate(node);
     if (!obj)
         return "";
 
     return obj->computedName();
 }
 
 void AXObjectCacheImpl::onTouchAccessibilityHover(const IntPoint& location)
 {
     AXObject* hit = root()->accessibilityHitTest(location);
-    if (hit)
+    if (hit) {
+        // Ignore events on a frame or plug-in, because the touch events
+        // will be re-targeted there and we don't want to fire duplicate
+        // accessibility events.
+        if (hit->getLayoutObject() && hit->getLayoutObject()->isLayoutPart())
+            return;
+
         postPlatformNotification(hit, AXHover);
+    }
 }
 
 void AXObjectCacheImpl::setCanvasObjectBounds(Element* element, const LayoutRect& rect)
 {
     AXObject* obj = getOrCreate(element);
     if (!obj)
         return;
 
     obj->setElementRect(rect);
 }
 
 DEFINE_TRACE(AXObjectCacheImpl)
 {
     visitor->trace(m_document);
     visitor->trace(m_nodeObjectMapping);
 
     visitor->trace(m_objects);
     visitor->trace(m_notificationsToPost);
 
     AXObjectCache::trace(visitor);
 }
 
 } // namespace blink