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 efdafbb7fdf63f77b1607c3fe6f9da43f9fb6e09..9c106ca1d2274eb40b8eefde27528452b0cb465e 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -1964,6 +1964,11 @@ void Document::updateStyle() {
       documentElement->recalcStyle(change);
     while (dirtyElementsForLayerUpdate())
       documentElement->recalcStyle(NoChange);
+    DCHECK(!documentElement->needsStyleRecalc());
+    DCHECK(!documentElement->childNeedsStyleRecalc());
+    if (documentElement->needsReattachLayoutTree() ||
+        documentElement->childNeedsReattachLayoutTree())
+      documentElement->rebuildLayoutTree();
   }
 
   view()->recalcOverflowAfterStyleChange();