Consolidate background fill layer opaqueness into one method

third_party/WebKit/Source/core/paint/BoxDecorationData.cpp

Index: third_party/WebKit/Source/core/paint/BoxDecorationData.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxDecorationData.cpp b/third_party/WebKit/Source/core/paint/BoxDecorationData.cpp
index dafa5088679eacd4808ba2454147c3c514503b6d..a597ddd830e1c7800b732fde66b5d9286a4256b8 100644
--- a/third_party/WebKit/Source/core/paint/BoxDecorationData.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxDecorationData.cpp
@@ -60,7 +60,7 @@ BackgroundBleedAvoidance BoxDecorationData::determineBackgroundBleedAvoidance(co
             // 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;