Call Element::rebuildLayoutTree from Document::updateStyle directly

third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp

 /*
  * Copyright (C) 2012 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 91 matching lines @@
   youngest.setYoungerShadowRoot(shadowRoot);
   shadowRoot.setOlderShadowRoot(youngest);
 }
 
 void ElementShadow::attach(const Node::AttachContext& context) {
   Node::AttachContext childrenContext(context);
   childrenContext.resolvedStyle = 0;
 
   for (ShadowRoot* root = &youngestShadowRoot(); root;
        root = root->olderShadowRoot()) {
-    if (root->needsAttach())
+    if (root->needsReattachLayoutTree())
       root->attachLayoutTree(childrenContext);
   }
 }
 
 void ElementShadow::detach(const Node::AttachContext& context) {
   Node::AttachContext childrenContext(context);
   childrenContext.resolvedStyle = 0;
 
   for (ShadowRoot* root = &youngestShadowRoot(); root;
        root = root->olderShadowRoot())
@@ skipping 45 matching lines @@
   visitor->trace(m_elementShadowV0);
   visitor->trace(m_shadowRoot);
 }
 
 DEFINE_TRACE_WRAPPERS(ElementShadow) {
   visitor->traceWrappers(m_elementShadowV0);
   visitor->traceWrappers(m_shadowRoot);
 }
 
 }  // namespace blink