Add iterator support to blink::EventPath.

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

 /*
  * Copyright (C) 2014 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 51 matching lines @@
 
 HeapVector<Member<EventTarget>>& TreeScopeEventContext::ensureEventPath(
     EventPath& path) {
   if (m_eventPath)
     return *m_eventPath;
 
   m_eventPath = new HeapVector<Member<EventTarget>>();
   LocalDOMWindow* window = path.windowEventContext().window();
   m_eventPath->reserveCapacity(path.size() + (window ? 1 : 0));
 
-  for (size_t i = 0; i < path.size(); ++i) {
-    if (path[i].treeScopeEventContext().isUnclosedTreeOf(*this))
-      m_eventPath->append(path[i].node());
+  for (auto& context : path.nodeEventContexts()) {
+    if (context.treeScopeEventContext().isUnclosedTreeOf(*this))
+      m_eventPath->append(context.node());
   }
   if (window)
     m_eventPath->append(window);
   return *m_eventPath;
 }
 
 TouchEventContext* TreeScopeEventContext::ensureTouchEventContext() {
   if (!m_touchEventContext)
     m_touchEventContext = TouchEventContext::create();
   return m_touchEventContext.get();
@@ skipping 30 matching lines @@
   for (const auto& context : m_children) {
     orderNumber = context->calculateTreeOrderAndSetNearestAncestorClosedTree(
         orderNumber + 1, containingClosedShadowTree());
   }
   m_postOrder = orderNumber + 1;
 
   return orderNumber + 1;
 }
 
 }  // namespace blink