Make sure Document::updateLayoutTree*() is called before Element::isFocusable().

third_party/WebKit/Source/core/html/HTMLLabelElement.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, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 185 matching lines @@
 bool HTMLLabelElement::willRespondToMouseClickEvents()
 {
     if (control() && control()->willRespondToMouseClickEvents())
         return true;
 
     return HTMLElement::willRespondToMouseClickEvents();
 }
 
 void HTMLLabelElement::focus(const FocusParams& params)
 {
+    document().updateLayoutTreeIgnorePendingStylesheets();
     if (isFocusable()) {
         HTMLElement::focus(params);
         return;
     }
     // To match other browsers, always restore previous selection.
     if (HTMLElement* element = control())
         element->focus(FocusParams(SelectionBehaviorOnFocus::Restore, params.type, params.sourceCapabilities));
 }
 
 void HTMLLabelElement::accessKeyAction(bool sendMouseEvents)
@@ skipping 62 matching lines @@
         if (attributeName == forAttr) {
             TreeScope& scope = treeScope();
             if (scope.shouldCacheLabelsByForAttribute())
                 updateLabel(scope, oldValue, attributeValue);
         }
         HTMLElement::parseAttribute(attributeName, oldValue, attributeValue);
     }
 }
 
 } // namespace blink