Use CanvasImageSource union type instead of overloading

Source/core/html/canvas/CanvasRenderingContext2D.h

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 #ifndef CanvasRenderingContext2D_h
 #define CanvasRenderingContext2D_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "bindings/core/v8/UnionTypesCore.h"
 #include "core/css/CSSFontSelectorClient.h"
 #include "core/html/canvas/Canvas2DContextAttributes.h"
 #include "core/html/canvas/CanvasPathMethods.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/canvas/HitRegion.h"
 #include "core/svg/SVGMatrixTearOff.h"
 #include "platform/fonts/Font.h"
 #include "platform/graphics/Color.h"
 #include "platform/geometry/FloatSize.h"
 #include "platform/graphics/GraphicsContext.h"
@@ skipping 17 matching lines @@
 class Path2D;
 class Element;
 class ExceptionState;
 class FloatRect;
 class HTMLCanvasElement;
 class HTMLImageElement;
 class HTMLVideoElement;
 class ImageData;
 class TextMetrics;
 
+typedef HTMLImageElementOrHTMLVideoElementOrHTMLCanvasElementOrImageBitmap CanvasImageSourceUnion;
+
 typedef WillBeHeapHashMap<String, RefPtrWillBeMember<MutableStylePropertySet>> MutableStylePropertyMap;
 
 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();
@@ skipping 96 matching lines @@
     void setShadow(float width, float height, float blur);
     void setShadow(float width, float height, float blur, const String& color);
     void setShadow(float width, float height, float blur, float grayLevel);
     void setShadow(float width, float height, float blur, const String& color, float alpha);
     void setShadow(float width, float height, float blur, float grayLevel, float alpha);
     void setShadow(float width, float height, float blur, float r, float g, float b, float a);
     void setShadow(float width, float height, float blur, float c, float m, float y, float k, float a);
 
     void clearShadow();
 
-    void drawImage(CanvasImageSource*, float x, float y, ExceptionState&);
-    void drawImage(CanvasImageSource*, float x, float y, float width, float height, ExceptionState&);
-    void drawImage(CanvasImageSource*, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh, ExceptionState&);
+    void drawImage(const CanvasImageSourceUnion&, float x, float y, ExceptionState&);
+    void drawImage(const CanvasImageSourceUnion&, float x, float y, float width, float height, ExceptionState&);
+    void drawImage(const CanvasImageSourceUnion&, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh, ExceptionState&);
 
     void drawImageFromRect(HTMLImageElement*, float sx = 0, float sy = 0, float sw = 0, float sh = 0,
                            float dx = 0, float dy = 0, float dw = 0, float dh = 0, const String& compositeOperation = emptyString());
 
     void setAlpha(float);
 
     void setCompositeOperation(const String&);
 
     PassRefPtrWillBeRawPtr<CanvasGradient> createLinearGradient(float x0, float y0, float x1, float y1);
     PassRefPtrWillBeRawPtr<CanvasGradient> createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1, ExceptionState&);
-    PassRefPtrWillBeRawPtr<CanvasPattern> createPattern(CanvasImageSource*, const String& repetitionType, ExceptionState&);
+    PassRefPtrWillBeRawPtr<CanvasPattern> createPattern(const CanvasImageSourceUnion&, const String& repetitionType, ExceptionState&);
 
     PassRefPtrWillBeRawPtr<ImageData> createImageData(PassRefPtrWillBeRawPtr<ImageData>) const;
     PassRefPtrWillBeRawPtr<ImageData> createImageData(float width, float height, ExceptionState&) const;
     PassRefPtrWillBeRawPtr<ImageData> getImageData(float sx, float sy, float sw, float sh, ExceptionState&) const;
     void putImageData(ImageData*, float dx, float dy);
     void putImageData(ImageData*, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight);
 
     void reset();
 
     String font() const;
@@ skipping 171 matching lines @@
     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