Allow reactions to enqueue other reactions for the same element

third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.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/dom/custom/CustomElementReactionStack.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/custom/CustomElementReactionQueue.h"
 
 namespace blink {
@@ skipping 12 matching lines @@
 }
 
 void CustomElementReactionStack::push()
 {
     m_stack.append(nullptr);
 }
 
 void CustomElementReactionStack::popInvokingReactions()
 {
     ElementQueue* queue = m_stack.last();
-    m_stack.removeLast();
-    if (!queue)
+    if (!queue) {
+        m_stack.removeLast();
         return;
-    for (auto& element : *queue) {
+    }
+
+    for (size_t i = 0; i < queue->size(); ++i) {
+        Element* element = (*queue)[i];
         if (CustomElementReactionQueue* reactions = m_map.get(element)) {
             reactions->invokeReactions(element);
             CHECK(reactions->isEmpty());
             m_map.remove(element);
         }
     }
+
+    m_stack.removeLast();
 }
 
 void CustomElementReactionStack::enqueue(
     Element* element,
     CustomElementReaction* reaction)
 {
     ElementQueue* queue = m_stack.last();
     if (!queue)
         m_stack.last() = queue = new ElementQueue();
     queue->append(element);
 
     CustomElementReactionQueue* reactions = m_map.get(element);
     if (!reactions) {
         reactions = new CustomElementReactionQueue();
         m_map.add(element, reactions);
     }
 
     reactions->add(reaction);
 }
 
 } // namespace blink