Support an Event Path API

Source/core/dom/EventContext.cpp

 /*
  * Copyright (C) 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 111 matching lines @@
 
 bool TouchEventContext::isTouchEventContext() const
 {
     return true;
 }
 
 #ifndef NDEBUG
 void TouchEventContext::checkReachability(TouchList* touchList) const
 {
     for (size_t i = 0; i < touchList->length(); ++i)
-        ASSERT(isReachable(touchList->item(i)->target()->toNode()));
+        ASSERT(touchList->item(i)->target()->toNode()->treeScope()->isInclusiveAncestorOf(m_node->treeScope()));
 }
 #endif
 
 }