Consolidate background fill layer opaqueness into one method

third_party/WebKit/Source/core/paint/BoxDecorationData.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 "core/paint/BoxDecorationData.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/paint/BoxPainter.h"
 #include "core/style/BorderEdge.h"
 #include "core/style/ComputedStyle.h"
@@ skipping 42 matching lines @@
     if (!hasBorderDecoration || !hasBorderRadius || layoutBox.canRenderBorderImage()) {
         if (layoutBox.backgroundShouldAlwaysBeClipped())
             return BackgroundBleedClipOnly;
         // Border radius clipping may require layer bleed avoidance if we are going to draw
         // an image over something else, because we do not want the antialiasing to lead to bleeding
         if (boxStyle.hasBackgroundImage() && hasBorderRadius) {
             // But if the top layer is opaque for the purposes of background painting, we do not
             // need the bleed avoidance because we will not paint anything behind the top layer.
             // But only if we need to draw something underneath.
             const FillLayer& fillLayer = layoutBox.style()->backgroundLayers();
-            if ((backgroundColor.alpha() || fillLayer.next()) && !BoxPainter::isFillLayerOpaque(fillLayer, layoutBox))
+            if ((backgroundColor.alpha() || fillLayer.next()) && !fillLayer.imageOccludesNextLayers(layoutBox))
                 return BackgroundBleedClipLayer;
         }
         return BackgroundBleedNone;
     }
 
     if (borderObscuresBackgroundEdge(boxStyle))
         return BackgroundBleedShrinkBackground;
 
     return BackgroundBleedClipLayer;
 }
 
 } // namespace blink