Call Element::rebuildLayoutTree from Document::updateStyle directly

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index ad7cb1132be820ad1e54480636220d97401532d4..69427172aaf18faa0cee9d89f4b5df153c8fb4ba 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -2047,6 +2047,11 @@ void Document::updateStyle() {
     inheritHtmlAndBodyElementStyles(change);
     if (documentElement->shouldCallRecalcStyle(change))
       documentElement->recalcStyle(change);
+    DCHECK(!documentElement->needsStyleRecalc());
+    DCHECK(!documentElement->childNeedsStyleRecalc());
+    if (documentElement->needsReattachLayoutTree() ||
+        documentElement->childNeedsReattachLayoutTree())
+      documentElement->rebuildLayoutTree();
   }
 
   view()->recalcOverflowAfterStyleChange();