Add iterator support to blink::EventPath.

third_party/WebKit/Source/core/events/EventPath.h

 /*
  * Copyright (C) 2013 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 34 matching lines @@
 class TreeScope;
 
 class CORE_EXPORT EventPath final : public GarbageCollected<EventPath> {
   WTF_MAKE_NONCOPYABLE(EventPath);
 
  public:
   explicit EventPath(Node&, Event* = nullptr);
 
   void initializeWith(Node&, Event*);
 
+  const HeapVector<NodeEventContext>& nodeEventContexts() const {
+    return m_nodeEventContexts;
+  }
+  HeapVector<NodeEventContext>& nodeEventContexts() {
+    return m_nodeEventContexts;
+  }
   NodeEventContext& operator[](size_t index) {
     return m_nodeEventContexts[index];
   }
   const NodeEventContext& operator[](size_t index) const {
     return m_nodeEventContexts[index];
   }
   NodeEventContext& at(size_t index) { return m_nodeEventContexts[index]; }
   NodeEventContext& last() { return m_nodeEventContexts[size() - 1]; }
 
   WindowEventContext& windowEventContext() {
@@ skipping 61 matching lines @@
   HeapVector<NodeEventContext> m_nodeEventContexts;
   Member<Node> m_node;
   Member<Event> m_event;
   HeapVector<Member<TreeScopeEventContext>> m_treeScopeEventContexts;
   Member<WindowEventContext> m_windowEventContext;
 };
 
 }  // namespace blink
 
 #endif