Support an Event Path API

Source/core/dom/Event.cpp

Index: Source/core/dom/Event.cpp
diff --git a/Source/core/dom/Event.cpp b/Source/core/dom/Event.cpp
index 637ca94f119a5c4126a3cadc82fddd7a2d856675..8a548c53423ad892c8b13cc356dc49b124f9df8d 100644
--- a/Source/core/dom/Event.cpp
+++ b/Source/core/dom/Event.cpp
@@ -26,6 +26,7 @@
 #include "core/dom/EventDispatcher.h"
 #include "core/dom/EventNames.h"
 #include "core/dom/EventTarget.h"
+#include "core/dom/StaticNodeList.h"
 #include "core/dom/UserGestureIndicator.h"
 #include "core/dom/WebCoreMemoryInstrumentation.h"
 #include <wtf/CurrentTime.h>
@@ -201,4 +202,19 @@ void Event::setUnderlyingEvent(PassRefPtr<Event> ue)
     m_underlyingEvent = ue;
 }
 
+PassRefPtr<NodeList> Event::path() const
+{
+    if (!m_currentTarget || !m_currentTarget->toNode())
+        return StaticNodeList::createEmpty();
+    Node* currentTarget = m_currentTarget->toNode();
+    Vector<RefPtr<Node> > nodes;
+    size_t eventPathSize = m_eventPath.size();
+    for (size_t i = 0; i < eventPathSize; ++i) {
+        Node* node = m_eventPath[i]->node();
+        if (currentTarget->canReach(node))
+            nodes.append(node);
+    }
+    return StaticNodeList::adopt(nodes);
+}
+
 } // namespace WebCore