Call Element::rebuildLayoutTree from Document::updateStyle directly

third_party/WebKit/Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 1279 matching lines @@
       if (element->shouldCallRecalcStyle(change))
         element->recalcStyle(change, lastTextNode);
       else if (element->supportsStyleSharing())
         styleResolver.addToStyleSharingList(*element);
       if (element->layoutObject())
         lastTextNode = nullptr;
     }
   }
 }
 
+void ContainerNode::rebuildChildrenLayoutTrees() {
+  DCHECK(!needsStyleRecalc());
+  DCHECK(!needsReattachLayoutTree());
+
+  for (Node* child = firstChild(); child; child = child->nextSibling()) {
+    if (child->needsReattachLayoutTree() ||
+        child->childNeedsReattachLayoutTree()) {
+      if (child->isTextNode())
+        toText(child)->rebuildTextLayoutTree();
+      else if (child->isElementNode())
+        toElement(child)->rebuildLayoutTree();
+    }
+  }
+  clearChildNeedsStyleRecalc();

[esprehn, 2016/12/14 04:30:47]

I don't think you need to clear this bit, it should be cleared already by the
reattach logic above if everything is working correctly.

[nainar, 2016/12/14 22:21:54]

Done.

+  clearChildNeedsReattachLayoutTree();
+}
+
 void ContainerNode::checkForSiblingStyleChanges(SiblingCheckType changeType,
                                                 Element* changedElement,
                                                 Node* nodeBeforeChange,
                                                 Node* nodeAfterChange) {
   if (!inActiveDocument() || document().hasPendingForcedStyleRecalc() ||
       getStyleChangeType() >= SubtreeStyleChange)
     return;
 
   if (!hasRestyleFlag(ChildrenAffectedByStructuralRules))
     return;
@@ skipping 159 matching lines @@
     return true;
 
   if (node->isElementNode() && toElement(node)->shadow())
     return true;
 
   return false;
 }
 #endif
 
 }  // namespace blink