Trigger style recalc when the window's active state change

Source/core/dom/Document.h

 /*
  * 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, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 449 matching lines @@
 
     // Special support for editing
     PassRefPtrWillBeRawPtr<Text> createEditingTextNode(const String&);
 
     void setupFontBuilder(RenderStyle* documentStyle);
 
     bool needsRenderTreeUpdate() const;
     void updateRenderTreeIfNeeded() { updateRenderTree(NoChange); }
     void updateRenderTreeForNodeIfNeeded(Node*);
     void updateLayout();
+    void updateRenderTreeOnFocusChanged();
+
     enum RunPostLayoutTasks {
         RunPostLayoutTasksAsyhnchronously,
         RunPostLayoutTasksSynchronously,
     };
     void updateLayoutIgnorePendingStylesheets(RunPostLayoutTasks = RunPostLayoutTasksAsyhnchronously);
     PassRefPtr<RenderStyle> styleForElementIgnoringPendingStylesheets(Element*);
     PassRefPtr<RenderStyle> styleForPage(int pageIndex);
 
     void updateDistributionForNodeIfNeeded(Node*);
 
@@ skipping 948 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h