Use SkXfermode::Mode in code related to Image.

Source/platform/graphics/GeneratedImage.cpp

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 
 namespace blink {
 
 void GeneratedImage::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
 {
     Image::computeIntrinsicDimensions(intrinsicWidth, intrinsicHeight, intrinsicRatio);
     intrinsicRatio = FloatSize();
 }
 
 void GeneratedImage::drawPattern(GraphicsContext* destContext, const FloatRect& srcRect, const FloatSize& scale,
-    const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& destRect, WebBlendMode blendMode,
+    const FloatPoint& phase, SkXfermode::Mode compositeOp, const FloatRect& destRect,
     const IntSize& repeatSpacing)
 {
     FloatRect tileRect = srcRect;
     tileRect.expand(repeatSpacing);
 
     GraphicsContext recordingContext(nullptr, nullptr);
     recordingContext.beginRecording(tileRect);
     drawTile(&recordingContext, srcRect);
     RefPtr<const SkPicture> tilePicture = recordingContext.endRecording();
 
     AffineTransform patternTransform;
     patternTransform.translate(phase.x(), phase.y());
     patternTransform.scale(scale.width(), scale.height());
     patternTransform.translate(tileRect.x(), tileRect.y());
 
     RefPtr<Pattern> picturePattern = Pattern::createPicturePattern(tilePicture);
     picturePattern->setPatternSpaceTransform(patternTransform);
 
     GraphicsContextStateSaver saver(*destContext);
-    destContext->setCompositeOperation(WebCoreCompositeToSkiaComposite(compositeOp, blendMode));
+    destContext->setCompositeOperation(compositeOp);
     destContext->setFillPattern(picturePattern);
     destContext->fillRect(destRect);
 }
 
 } // namespace blink