Make event.composedPath() on window behave the same way as that on document

third_party/WebKit/Source/core/events/Event.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 309 matching lines @@
     size_t eventPathSize = m_eventPath->size();
     for (size_t i = 0; i < eventPathSize; ++i) {
       if (node == (*m_eventPath)[i].node()) {
         return (*m_eventPath)[i].treeScopeEventContext().ensureEventPath(
             *m_eventPath);
       }
     }
     NOTREACHED();
   }
 
-  // Returns [window] for events that are directly dispatched to the window object;
-  // e.g., window.load, pageshow, etc.
-  if (LocalDOMWindow* window = m_currentTarget->toLocalDOMWindow())
+  if (LocalDOMWindow* window = m_currentTarget->toLocalDOMWindow()) {
+    if (m_eventPath && !m_eventPath->isEmpty()) {
+      return m_eventPath->topNodeEventContext()
+          .treeScopeEventContext()
+          .ensureEventPath(*m_eventPath);
+    }
     return HeapVector<Member<EventTarget>>(1, window);
+  }
 
   return HeapVector<Member<EventTarget>>();
 }
 
 EventDispatchMediator* Event::createMediator() {
   return EventDispatchMediator::create(this);
 }
 
 double Event::timeStamp(ScriptState* scriptState) const {
   double timeStamp = 0;
@@ skipping 16 matching lines @@
 }
 
 DEFINE_TRACE(Event) {
   visitor->trace(m_currentTarget);
   visitor->trace(m_target);
   visitor->trace(m_underlyingEvent);
   visitor->trace(m_eventPath);
 }
 
 }  // namespace blink