Use SkXfermode::Mode in code related to Image.

Source/core/paint/ImagePainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/ImagePainter.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/editing/FrameSelection.h"
@@ skipping 118 matching lines @@
 
     // FIXME: why is interpolation quality selection not included in the Instrumentation reported cost of drawing an image?
     InterpolationQuality interpolationQuality = BoxPainter::chooseInterpolationQuality(m_renderImage, context, image.get(), image.get(), LayoutSize(alignedRect.size()));
 
     TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "PaintImage", "data", InspectorPaintImageEvent::data(m_renderImage));
     // FIXME: crbug.com/361045 remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
     InspectorInstrumentation::willPaintImage(&m_renderImage);
 
     InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
     context->setImageInterpolationQuality(interpolationQuality);
-    context->drawImage(image.get(), alignedRect, CompositeSourceOver, m_renderImage.shouldRespectImageOrientation());
+    context->drawImage(image.get(), alignedRect, SkXfermode::kSrcOver_Mode, m_renderImage.shouldRespectImageOrientation());
     context->setImageInterpolationQuality(previousInterpolationQuality);
 
     InspectorInstrumentation::didPaintImage(&m_renderImage);
 }
 
 } // namespace blink