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

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 3597 matching lines @@
             oldFocusedElement->dispatchFocusOutEvent(EventTypeNames::focusout, newFocusedElement.get(), params.sourceCapabilities); // DOM level 3 name for the bubbling blur event.
             // FIXME: We should remove firing DOMFocusOutEvent event when we are sure no content depends
             // on it, probably when <rdar://problem/8503958> is resolved.
             oldFocusedElement->dispatchFocusOutEvent(EventTypeNames::DOMFocusOut, newFocusedElement.get(), params.sourceCapabilities); // DOM level 2 name for compatibility.
 
             if (m_focusedElement) {
                 // handler shifted focus
                 focusChangeBlocked = true;
                 newFocusedElement = nullptr;
             }
-            // Event handlers might make newFocusedElement dirty.
-            if (newFocusedElement)
-                updateLayoutTreeIgnorePendingStylesheets();
         }
 
         if (view()) {
             Widget* oldWidget = widgetForElement(*oldFocusedElement);
             if (oldWidget)
                 oldWidget->setFocus(false, params.type);
             else
                 view()->setFocus(false, params.type);
         }
     }
 
+    if (newFocusedElement)
+        updateLayoutTreeIgnorePendingStylesheets();
     if (newFocusedElement && newFocusedElement->isFocusable()) {
         if (newFocusedElement->isRootEditableElement() && !acceptsEditingFocus(*newFocusedElement)) {
             // delegate blocks focus change
             focusChangeBlocked = true;
             goto SetFocusedElementDone;
         }
         // Set focus on the new node
         m_focusedElement = newFocusedElement;
 
         m_focusedElement->setFocus(true);
@@ skipping 2300 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     Document::WeakDocumentSet& set = Document::liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif