Move viewport unit resolution to style recalc time

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 996 matching lines @@
 
     enum HttpRefreshType {
         HttpRefreshFromHeader,
         HttpRefreshFromMetaTag
     };
     void maybeHandleHttpRefresh(const String&, HttpRefreshType);
 
     void updateSecurityOrigin(PassRefPtr<SecurityOrigin>);
     PassOwnPtr<LifecycleNotifier<Document> > createLifecycleNotifier();
 
+    void setHasViewportUnits() { m_hasViewportUnits = true; }
+    bool hasViewportUnits() const { return m_hasViewportUnits; }
+    void notifyResizeForViewportUnits();
+
 protected:
     Document(const DocumentInit&, DocumentClassFlags = DefaultDocumentClass);
 
     virtual void didUpdateSecurityOrigin() OVERRIDE;
 
     void clearXMLVersion() { m_xmlVersion = String(); }
 
     virtual void dispose() OVERRIDE;
 
     virtual PassRefPtr<Document> cloneDocumentWithoutChildren();
@@ skipping 274 matching lines @@
     OwnPtr<AnimationClock> m_animationClock;
     RefPtr<DocumentTimeline> m_timeline;
     RefPtr<DocumentTimeline> m_transitionTimeline;
     CSSPendingAnimations m_cssPendingAnimations;
 
     RefPtr<Document> m_templateDocument;
     Document* m_templateDocumentHost; // Manually managed weakref (backpointer from m_templateDocument).
 
     Timer<Document> m_didAssociateFormControlsTimer;
     HashSet<RefPtr<Element> > m_associatedFormControls;
+
+    bool m_hasViewportUnits;
 };
 
 inline void Document::notifyRemovePendingSheetIfNeeded()
 {
     if (m_needsNotifyRemoveAllPendingStylesheet)
         didRemoveAllPendingStylesheet();
 }
 
 inline const Document* Document::templateDocument() const
 {
@@ skipping 42 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == documentInternal();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h