Add iterator support to blink::EventPath.

third_party/WebKit/Source/core/input/PointerEventManager.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/input/PointerEventManager.h"
 
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/shadow/FlatTreeTraversal.h"
 #include "core/events/MouseEvent.h"
@@ skipping 463 matching lines @@
         mouseEvent.pointerProperties().pointerType)] = true;
   }
 
   if (pointerEvent->isPrimary() &&
       !m_preventMouseEventForPointerType[toPointerTypeIndex(
           mouseEvent.pointerProperties().pointerType)]) {
     EventTarget* mouseTarget = effectiveTarget;
     // Event path could be null if pointer event is not dispatched and
     // that happens for example when pointer event feature is not enabled.
     if (!isInDocument(mouseTarget) && pointerEvent->hasEventPath()) {
-      for (size_t i = 0; i < pointerEvent->eventPath().size(); i++) {
-        if (isInDocument(pointerEvent->eventPath()[i].node())) {
-          mouseTarget = pointerEvent->eventPath()[i].node();
+      for (const auto& context :
+           pointerEvent->eventPath().nodeEventContexts()) {
+        if (isInDocument(context.node())) {
+          mouseTarget = context.node();
           break;
         }
       }
     }
     result = EventHandlingUtil::mergeEventResult(
         result, m_mouseEventManager->dispatchMouseEvent(
                     mouseTarget, mouseEventType, mouseEvent, nullptr));
   }
 
   if (pointerEvent->type() == EventTypeNames::pointerup ||
@@ skipping 198 matching lines @@
       return true;
   }
   return false;
 }
 
 EventTarget* PointerEventManager::getMouseCapturingNode() {
   return getCapturingNode(PointerEventFactory::s_mouseId);
 }
 
 }  // namespace blink