Call Element::rebuildLayoutTree from Document::updateStyle directly

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 166 matching lines @@
   return m_distributedNodes[index - 1].get();
 }
 
 AtomicString HTMLSlotElement::name() const {
   return normalizeSlotName(fastGetAttribute(HTMLNames::nameAttr));
 }
 
 void HTMLSlotElement::attachLayoutTree(const AttachContext& context) {
   if (supportsDistribution()) {
     for (auto& node : m_distributedNodes) {
-      if (node->needsAttach())
+      if (node->needsReattachLayoutTree())
         node->attachLayoutTree(context);
     }
   }
   HTMLElement::attachLayoutTree(context);
 }
 
 void HTMLSlotElement::detachLayoutTree(const AttachContext& context) {
   if (supportsDistribution()) {
     for (auto& node : m_distributedNodes)
       node->lazyReattachIfAttached();
@@ skipping 163 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