Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/filters/SourceGraphic.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2013 Google 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SourceGraphic_h
 #define SourceGraphic_h
 
-#include "core/platform/graphics/filters/Filter.h"
-#include "core/platform/graphics/filters/FilterEffect.h"
+#include "platform/graphics/filters/Filter.h"
+#include "platform/graphics/filters/FilterEffect.h"
 
 namespace WebCore {
 
-class SourceGraphic : public FilterEffect {
+class PLATFORM_EXPORT SourceGraphic : public FilterEffect {
 public:
     static PassRefPtr<SourceGraphic> create(Filter*);
 
     static const AtomicString& effectName();
 
     virtual void determineAbsolutePaintRect();
 
     virtual FilterEffectType filterEffectType() const { return FilterEffectTypeSourceInput; }
 
     virtual TextStream& externalRepresentation(TextStream&, int indention) const;
 
 private:
     SourceGraphic(Filter* filter)
         : FilterEffect(filter)
     {
         setOperatingColorSpace(ColorSpaceDeviceRGB);
     }
 
     virtual void applySoftware() OVERRIDE;
 };
 
 } //namespace WebCore
 
 #endif // SourceGraphic_h