Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
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  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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 #ifndef OpaqueRectTrackingContentLayerDelegate_h
 #define OpaqueRectTrackingContentLayerDelegate_h
 
+#include "platform/PlatformExport.h"
 #include "public/platform/WebContentLayerClient.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
 
 class SkCanvas;
 
 namespace WebCore {
 
 class GraphicsContext;
 class IntRect;
 
-class GraphicsContextPainter {
+class PLATFORM_EXPORT GraphicsContextPainter {
 public:
     virtual void paint(GraphicsContext&, const IntRect& clip) = 0;
 
 protected:
     virtual ~GraphicsContextPainter() { }
 };
 
-class OpaqueRectTrackingContentLayerDelegate : public blink::WebContentLayerClient {
+class PLATFORM_EXPORT OpaqueRectTrackingContentLayerDelegate : public blink::WebContentLayerClient {
     WTF_MAKE_NONCOPYABLE(OpaqueRectTrackingContentLayerDelegate);
 public:
     explicit OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter*);
     virtual ~OpaqueRectTrackingContentLayerDelegate();
 
     // If we know that everything that will be painted through this delegate, then we don't bother
     // tracking opaqueness.
     void setOpaque(bool opaque) { m_opaque = opaque; }
 
     // blink::WebContentLayerClient implementation.
     virtual void paintContents(SkCanvas*, const blink::WebRect& clip, bool canPaintLCDText, blink::WebFloatRect& opaque) OVERRIDE;
 
 private:
     GraphicsContextPainter* m_painter;
     bool m_opaque;
 };
 
 }
 
 #endif // OpaqueRectTrackingContentLayerDelegate_h