Make Event.path() return a pre-calculated NodeList rather than calculating it dynamically.

Source/core/dom/EventContext.cpp

Index: Source/core/dom/EventContext.cpp
diff --git a/Source/core/dom/EventContext.cpp b/Source/core/dom/EventContext.cpp
index 7b8dd56cd504ce2521f350e611f31594d105d028..30a44c5e28b3427669959150e968481ad6a01912 100644
--- a/Source/core/dom/EventContext.cpp
+++ b/Source/core/dom/EventContext.cpp
@@ -32,6 +32,7 @@
 #include "core/dom/FocusEvent.h"
 #include "core/dom/MouseEvent.h"
 #include "core/dom/Node.h"
+#include "core/dom/StaticNodeList.h"
 #include "core/dom/TouchEvent.h"
 #include "core/dom/TouchList.h"
 #include "core/page/DOMWindow.h"
@@ -51,6 +52,11 @@ EventContext::~EventContext()
 {
 }
 
+void EventContext::adoptEventPath(Vector<RefPtr<Node> >& nodes)
+{
+    m_eventPath = StaticNodeList::adopt(nodes);
+}
+
 void EventContext::handleLocalEvents(Event* event) const
 {
     event->setTarget(m_target.get());