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 29ba52b55ea0d02da77725f16084e735de41dcb3..0f2ae18c70bb927808132a35f7d98b68723e555e 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -2045,6 +2045,11 @@ 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();