Moving GraphicsContext and dependencies from core to platform.

Source/platform/graphics/StrokeData.cpp

 // Copyright (C) 2013 Google Inc. All rights reserved.
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 #include "config.h"
-#include "core/platform/graphics/StrokeData.h"
+#include "platform/graphics/StrokeData.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 static const int dashRatio = 3; // Ratio of the length of a dash to its width.
 
 void StrokeData::setLineDash(const DashArray& dashes, float dashOffset)
 {
     // FIXME: This is lifted directly off SkiaSupport, lines 49-74
@@ skipping 61 matching lines @@
             SkScalar intervals[2] = { dashLengthSk, dashLengthSk };
             RefPtr<SkDashPathEffect> pathEffect = adoptRef(new SkDashPathEffect(intervals, 2, SkIntToScalar(phase)));
             paint->setPathEffect(pathEffect.get());
         }
     }
 
     return width;
 }
 
 } // namespace