Compute style-determined compositing reasons during recalc style

Source/core/rendering/compositing/RenderLayerCompositor.h

 /*
  * Copyright (C) 2009 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 181 matching lines @@
     void addOutOfFlowPositionedLayer(RenderLayer*);
     void removeOutOfFlowPositionedLayer(RenderLayer*);
 
     void resetTrackedRepaintRects();
     void setTracksRepaints(bool);
 
     void setNeedsToRecomputeCompositingRequirements() { m_needsToRecomputeCompositingRequirements = true; }
 
     virtual String debugName(const GraphicsLayer*) OVERRIDE;
 
+    void updateStyleDeterminedCompositingReasons(RenderLayer*);
+
     void scheduleAnimationIfNeeded();
 
 private:
     class OverlapMap;
 
     enum CompositingStateTransitionType {
         NoCompositingStateChange,
         AllocateOwnCompositedLayerMapping,
         RemoveOwnCompositedLayerMapping,
         PutInSquashingLayer,
@@ skipping 164 matching lines @@
     OwnPtr<GraphicsLayer> m_layerForScrollCorner;
 #if USE(RUBBER_BANDING)
     OwnPtr<GraphicsLayer> m_layerForOverhangShadow;
 #endif
 };
 
 
 } // namespace WebCore
 
 #endif // RenderLayerCompositor_h