Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h

Index: Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h
diff --git a/Source/core/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h b/Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h
similarity index 93%
rename from Source/core/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h
rename to Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h
index 8aece8762d5426a22d03a96e7a32b9487de01f5b..e870b9cf92d1d8baae11e220192b9d6b29b45756 100644
--- a/Source/core/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h
+++ b/Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h
@@ -25,6 +25,7 @@
 #ifndef OpaqueRectTrackingContentLayerDelegate_h
 #define OpaqueRectTrackingContentLayerDelegate_h
 
+#include "platform/PlatformExport.h"
 #include "public/platform/WebContentLayerClient.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
@@ -36,7 +37,7 @@ namespace WebCore {
 class GraphicsContext;
 class IntRect;
 
-class GraphicsContextPainter {
+class PLATFORM_EXPORT GraphicsContextPainter {
 public:
     virtual void paint(GraphicsContext&, const IntRect& clip) = 0;
 
@@ -44,7 +45,7 @@ protected:
     virtual ~GraphicsContextPainter() { }
 };
 
-class OpaqueRectTrackingContentLayerDelegate : public blink::WebContentLayerClient {
+class PLATFORM_EXPORT OpaqueRectTrackingContentLayerDelegate : public blink::WebContentLayerClient {
     WTF_MAKE_NONCOPYABLE(OpaqueRectTrackingContentLayerDelegate);
 public:
     explicit OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter*);