Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/Canvas2DLayerManager.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
 are met:
 1.  Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
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     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
 
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 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
 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 */
 
 #ifndef Canvas2DLayerManager_h
 #define Canvas2DLayerManager_h
 
-#include "core/platform/graphics/Canvas2DLayerBridge.h"
+#include "platform/graphics/Canvas2DLayerBridge.h"
 #include "public/platform/WebThread.h"
 
 class Canvas2DLayerManagerTest;
 
 namespace WebCore {
 
-class Canvas2DLayerManager : public blink::WebThread::TaskObserver {
+class PLATFORM_EXPORT Canvas2DLayerManager : public blink::WebThread::TaskObserver {
 public:
     static Canvas2DLayerManager& get();
     void init(size_t maxBytesAllocated, size_t targetBytesAllocated);
     virtual ~Canvas2DLayerManager();
 
     void layerAllocatedStorageChanged(Canvas2DLayerBridge*, intptr_t deltaBytes);
     void layerDidDraw(Canvas2DLayerBridge*);
     void layerToBeDestroyed(Canvas2DLayerBridge*);
 private:
     Canvas2DLayerManager();
@@ skipping 12 matching lines @@
     bool m_taskObserverActive;
     DoublyLinkedList<Canvas2DLayerBridge> m_layerList;
 
     friend class ::Canvas2DLayerManagerTest; // for unit testing
 };
 
 }
 
 #endif