Use SkXfermode::Mode in code related to Image.

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index a17a323cc3706beaaf7dbf7b0a1d5a39603ef24a..798e1e9731bb1ce9daba14384c69a6539a43e262 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -186,7 +186,6 @@ public:
     SkXfermode::Mode compositeOperation() const;
     // TODO(dshwang): remove these method. crbug.com/425656
     CompositeOperator compositeOperationDeprecated() const;
-    WebBlendMode blendModeOperation() const;
 
     // Specify the device scale factor which may change the way document markers
     // and fonts are rendered.
@@ -264,17 +263,16 @@ public:
     void drawPicture(const SkPicture*);
     void compositePicture(SkPicture*, const FloatRect& dest, const FloatRect& src, CompositeOperator, WebBlendMode);
 
-    void drawImage(Image*, const IntPoint&, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation);
-    void drawImage(Image*, const IntRect&, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation);
+    void drawImage(Image*, const IntPoint&, SkXfermode::Mode = SkXfermode::kSrcOver_Mode, RespectImageOrientationEnum = DoNotRespectImageOrientation);
+    void drawImage(Image*, const IntRect&, SkXfermode::Mode = SkXfermode::kSrcOver_Mode, RespectImageOrientationEnum = DoNotRespectImageOrientation);
     void drawImage(Image*, const FloatRect& destRect);
-    void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator = CompositeSourceOver, RespectImageOrientationEnum = DoNotRespectImageOrientation);
-    void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator, WebBlendMode, RespectImageOrientationEnum = DoNotRespectImageOrientation);
+    void drawImage(Image*, const FloatRect& destRect, const FloatRect& srcRect, SkXfermode::Mode = SkXfermode::kSrcOver_Mode, RespectImageOrientationEnum = DoNotRespectImageOrientation);
 
     void drawTiledImage(Image*, const IntRect& destRect, const IntPoint& srcPoint, const IntSize& tileSize,
-        CompositeOperator = CompositeSourceOver, WebBlendMode = WebBlendModeNormal, const IntSize& repeatSpacing = IntSize());
+        SkXfermode::Mode = SkXfermode::kSrcOver_Mode, const IntSize& repeatSpacing = IntSize());
     void drawTiledImage(Image*, const IntRect& destRect, const IntRect& srcRect,
         const FloatSize& tileScaleFactor, Image::TileRule hRule = Image::StretchTile, Image::TileRule vRule = Image::StretchTile,
-        CompositeOperator = CompositeSourceOver);
+        SkXfermode::Mode = SkXfermode::kSrcOver_Mode);
 
     void drawImageBuffer(ImageBuffer*, const FloatRect& destRect, const FloatRect* srcRect = 0, CompositeOperator = CompositeSourceOver, WebBlendMode = WebBlendModeNormal);
 
@@ -385,8 +383,7 @@ public:
         SkPaint*,
         const SkRect& srcRect,
         const SkRect& destRect,
-        CompositeOperator,
-        WebBlendMode,
+        SkXfermode::Mode,
         bool isBitmapWithAlpha,
         bool isLazyDecoded = false,
         bool isDataComplete = true) const;