Make updateStyleAndLayoutTree ready for async stylesheet update.

third_party/WebKit/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)
@@ skipping 1209 matching lines @@
 
   enum HttpRefreshType { HttpRefreshFromHeader, HttpRefreshFromMetaTag };
   void maybeHandleHttpRefresh(const String&, HttpRefreshType);
 
   void updateSecurityOrigin(PassRefPtr<SecurityOrigin>);
 
   void setHasViewportUnits() { m_hasViewportUnits = true; }
   bool hasViewportUnits() const { return m_hasViewportUnits; }
   void notifyResizeForViewportUnits();
 
+  void updateActiveStyle();
   void updateStyleInvalidationIfNeeded();
 
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
   AtomicString convertLocalName(const AtomicString&);
 
   void platformColorsChanged();
 
@@ skipping 474 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif  // Document_h