Use IDL union types for CanvasRenderingContext2D.{fill,stroke}Style

Source/core/html/canvas/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
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 class CanvasRenderingContext2D final: public CanvasRenderingContext, public ScriptWrappable, public CanvasPathMethods {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassOwnPtrWillBeRawPtr<CanvasRenderingContext2D> create(HTMLCanvasElement* canvas, const Canvas2DContextAttributes* attrs, Document& document)
     {
         return adoptPtrWillBeNoop(new CanvasRenderingContext2D(canvas, attrs, document));
     }
     virtual ~CanvasRenderingContext2D();
 
-    CanvasStyle* strokeStyle() const;
-    void setStrokeStyle(PassRefPtrWillBeRawPtr<CanvasStyle>);
+    void strokeStyle(StringOrCanvasGradientOrCanvasPattern&) const;
+    void setStrokeStyle(const StringOrCanvasGradientOrCanvasPattern&);
 
-    CanvasStyle* fillStyle() const;
-    void setFillStyle(PassRefPtrWillBeRawPtr<CanvasStyle>);
+    void fillStyle(StringOrCanvasGradientOrCanvasPattern&) const;
+    void setFillStyle(const StringOrCanvasGradientOrCanvasPattern&);
 
     float lineWidth() const;
     void setLineWidth(float);
 
     String lineCap() const;
     void setLineCap(const String&);
 
     String lineJoin() const;
     void setLineJoin(const String&);
 
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     Timer<CanvasRenderingContext2D> m_dispatchContextLostEventTimer;
     Timer<CanvasRenderingContext2D> m_dispatchContextRestoredEventTimer;
     Timer<CanvasRenderingContext2D> m_tryRestoreContextEventTimer;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context, context->is2d(), context.is2d());
 
 } // namespace blink
 
 #endif // CanvasRenderingContext2D_h