Fixed position elements should layout relative to transformed container

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index 36d71e129a33e5656080356000b409fdd9df72f6..c56125a15a178687d2ac0e647d4773554b8e1124 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -1882,8 +1882,10 @@ static inline const RenderLayer* accumulateOffsetTowardsAncestor(const RenderLay
             ancestorLayer->convertToLayerCoords(fixedPositionContainerLayer, ancestorCoords);
 
             location += (fixedContainerCoords - ancestorCoords);
-            return ancestorLayer;
+        } else {
+            location += toSize(layer->location());
         }
+        return ancestorLayer;
     }
     
     RenderLayer* parentLayer;