Rename isNormalFlowOnly to something meaningful

Source/core/layout/compositing/GraphicsLayerUpdater.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google 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
@@ skipping 40 matching lines @@
         CompositingState compositingState = layer.compositingState();
         if (compositingState != NotComposited && compositingState != PaintsIntoGroupedBacking) {
             m_compositingAncestor = &layer;
             if (layer.stackingNode()->isStackingContext())
                 m_compositingStackingContext = &layer;
         }
     }
 
     const DeprecatedPaintLayer* compositingContainer(const DeprecatedPaintLayer& layer) const
     {
-        return layer.stackingNode()->isNormalFlowOnly() ? m_compositingAncestor : m_compositingStackingContext;
+        return layer.stackingNode()->isTreatedAsStackingContextForPainting() ? m_compositingStackingContext : m_compositingAncestor;
     }
 
     const DeprecatedPaintLayer* compositingStackingContext() const
     {
         return m_compositingStackingContext;
     }
 
 private:
     const DeprecatedPaintLayer* m_compositingStackingContext;
     const DeprecatedPaintLayer* m_compositingAncestor;
@@ skipping 49 matching lines @@
     if (layer.hasCompositedDeprecatedPaintLayerMapping())
         layer.compositedDeprecatedPaintLayerMapping()->assertNeedsToUpdateGraphicsLayerBitsCleared();
 
     for (DeprecatedPaintLayer* child = layer.firstChild(); child; child = child->nextSibling())
         assertNeedsToUpdateGraphicsLayerBitsCleared(*child);
 }
 
 #endif
 
 } // namespace blink