Add compile flag for enabling the compostior

sky/engine/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 119 matching lines @@
 
     float inputEventsScaleFactor() const;
     IntSize inputEventsOffsetForEmulation() const;
     void setInputEventsTransformForEmulation(const IntSize&, float);
 
     AtomicString mediaType() const;
     void setMediaType(const AtomicString&);
 
     void postLayoutTimerFired(Timer<FrameView>*);
 
+#if !ENABLE(COMPOSITOR)
+    void paint(GraphicsContext* context, const IntRect& rect) override;
+#endif
+
     void paintContents(GraphicsContext*, const IntRect& damageRect);
     void setPaintBehavior(PaintBehavior);
     PaintBehavior paintBehavior() const;
     bool isPainting() const;
     bool hasEverPainted() const { return m_lastPaintTime; }
     void setNodeToDraw(Node*);
 
     Color documentBackgroundColor() const;
 
     static double currentFrameTimeStamp() { return s_currentFrameTimeStamp; }
@@ skipping 178 matching lines @@
         m_view->setCanInvalidatePaintDuringPerformLayout(m_originalValue);
     }
 private:
     FrameView* m_view;
     bool m_originalValue;
 };
 
 } // namespace blink
 
 #endif // FrameView_h