Make beginLayer() and CanvasRenderingContext2D use SkXfermode::Mode.

Source/core/rendering/svg/RenderSVGResourceMasker.cpp

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 68 matching lines @@
 
     FloatRect paintInvalidationRect = object->paintInvalidationRectInLocalCoordinates();
 
     const SVGRenderStyle& svgStyle = style()->svgStyle();
     ColorFilter maskLayerFilter = svgStyle.maskType() == MT_LUMINANCE
         ? ColorFilterLuminanceToAlpha : ColorFilterNone;
     ColorFilter maskContentFilter = svgStyle.colorInterpolation() == CI_LINEARRGB
         ? ColorFilterSRGBToLinearRGB : ColorFilterNone;
 
     // Mask layer start.
-    context->beginLayer(1, CompositeDestinationIn, &paintInvalidationRect, maskLayerFilter);
+    context->beginLayer(1, SkXfermode::kDstIn_Mode, &paintInvalidationRect, maskLayerFilter);
     {
         // Draw the mask with color conversion (when needed).
         GraphicsContextStateSaver maskContentSaver(*context);
         context->setColorFilter(maskContentFilter);
 
         drawMaskForRenderer(context, object->objectBoundingBox());
     }
 
     // Transfer mask layer -> content layer (DstIn)
     context->endLayer();
@@ skipping 77 matching lines @@
         transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
         transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         maskRect = transform.mapRect(maskRect);
     }
 
     maskRect.intersect(maskBoundaries);
     return maskRect;
 }
 
 }