Make slotchange events bubble

third_party/WebKit/Source/core/html/HTMLSlotElement.cpp

 /*
  * Copyright (C) 2015 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 136 matching lines @@
 
 void HTMLSlotElement::saveAndClearDistribution()
 {
     m_oldDistributedNodes.swap(m_distributedNodes);
     clearDistribution();
 }
 
 void HTMLSlotElement::dispatchSlotChangeEvent()
 {
     m_slotchangeEventEnqueued = false;
-    Event* event = Event::create(EventTypeNames::slotchange);
+    Event* event = Event::createBubble(EventTypeNames::slotchange);
     event->setTarget(this);
     dispatchScopedEvent(event);
 }
 
 Node* HTMLSlotElement::distributedNodeNextTo(const Node& node) const
 {
     const auto& it = m_distributedIndices.find(&node);
     if (it == m_distributedIndices.end())
         return nullptr;
     size_t index = it->value;
@@ skipping 188 matching lines @@
 DEFINE_TRACE(HTMLSlotElement)
 {
     visitor->trace(m_assignedNodes);
     visitor->trace(m_distributedNodes);
     visitor->trace(m_oldDistributedNodes);
     visitor->trace(m_distributedIndices);
     HTMLElement::trace(visitor);
 }
 
 } // namespace blink