Adjust background clip when local attachment is used with non-visible overflow.

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 80 matching lines @@
     return pixelSnappedIntRect(toLayoutBox(layoutObject)->contentBoxRect());
 }
 
 static IntRect backgroundRect(const LayoutObject* layoutObject)
 {
     if (!layoutObject->isBox())
         return IntRect();
 
     LayoutRect rect;
     const LayoutBox* box = toLayoutBox(layoutObject);
-    EFillBox clip = box->style()->backgroundClip();
-    switch (clip) {
-    case BorderFillBox:
-        rect = box->borderBoxRect();
-        break;
-    case PaddingFillBox:
-        rect = box->paddingBoxRect();
-        break;
-    case ContentFillBox:
-        rect = box->contentBoxRect();
-        break;
-    case TextFillBox:
-        break;
-    }
-
-    return pixelSnappedIntRect(rect);
+    return pixelSnappedIntRect(box->backgroundClipRect());
 }
 
 static inline bool isAcceleratedCanvas(const LayoutObject* layoutObject)
 {
     if (layoutObject->isCanvas()) {
         HTMLCanvasElement* canvas = toHTMLCanvasElement(layoutObject->node());
         if (CanvasRenderingContext* context = canvas->renderingContext())
             return context->isAccelerated();
     }
     return false;
@@ skipping 2542 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink