Remove some dead RenderLayer code.

sky/engine/core/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 196 matching lines @@
     const RenderLayerClipper& clipper() const { return m_clipper; }
 
     inline bool isPositionedContainer() const
     {
         // FIXME: This is not in sync with containingBlock.
         RenderBox* layerRenderer = renderer();
         return isRootLayer() || layerRenderer->isPositioned() || hasTransform();
     }
 
     void updateOrRemoveFilterEffectRenderer();
-    void updateSelfPaintingLayer();
 
     void clipToRect(const LayerPaintingInfo&, GraphicsContext*, const ClipRect&, BorderRadiusClippingRule = IncludeSelfForBorderRadius);
     void restoreClip(GraphicsContext*, const LayoutRect& paintDirtyRect, const ClipRect&);
 
 private:
-    // TODO(ojan): Get rid of this. These are basically layer-tree-only paint phases.
-    enum PaintLayerFlags {
-        PaintContent,
-    };
-
     // Bounding box in the coordinates of this layer.
     LayoutRect logicalBoundingBox() const;
 
-    void setAncestorChainHasSelfPaintingLayerDescendant();
-    void dirtyAncestorChainHasSelfPaintingLayerDescendantStatus();
-
     void setNextSibling(RenderLayer* next) { m_next = next; }
     void setPreviousSibling(RenderLayer* prev) { m_previous = prev; }
     void setFirstChild(RenderLayer* first) { m_first = first; }
     void setLastChild(RenderLayer* last) { m_last = last; }
 
-    void updateHasSelfPaintingLayerDescendant() const;
-
-    bool hasSelfPaintingLayerDescendant() const
-    {
-        if (m_hasSelfPaintingLayerDescendantDirty)
-            updateHasSelfPaintingLayerDescendant();
-        ASSERT(!m_hasSelfPaintingLayerDescendantDirty);
-        return m_hasSelfPaintingLayerDescendant;
-    }
-
     LayoutPoint renderBoxLocation() const { return renderer()->location(); }
 
     bool shouldBeSelfPaintingLayer() const;
 
     // FIXME: We should only create the stacking node if needed.
     bool requiresStackingNode() const { return true; }
     void updateStackingNode();
 
     void updateTransform(const RenderStyle* oldStyle, RenderStyle* newStyle);
 
     void dirty3DTransformedDescendantStatus();
 
     void updateOrRemoveFilterClients();
 
     LayerType m_layerType;
 
     // Self-painting layer is an optimization where we avoid the heavy RenderLayer painting
     // machinery for a RenderLayer allocated only to handle the overflow clip case.
     // FIXME(crbug.com/332791): Self-painting layer should be merged into the overflow-only concept.
     unsigned m_isSelfPaintingLayer : 1;
 
-    // If have no self-painting descendants, we don't have to walk our children during painting. This can lead to
-    // significant savings, especially if the tree has lots of non-self-painting layers grouped together (e.g. table cells).
-    mutable unsigned m_hasSelfPaintingLayerDescendant : 1;
-    mutable unsigned m_hasSelfPaintingLayerDescendantDirty : 1;
-
     const unsigned m_isRootLayer : 1;
 
     unsigned m_3DTransformedDescendantStatusDirty : 1;
     // Set on a stacking context layer that has 3D descendants anywhere
     // in a preserves3D hierarchy. Hint to do 3D-aware hit testing.
     unsigned m_has3DTransformedDescendant : 1;
 
     unsigned m_hasFilterInfo : 1;
 
     RenderBox* m_renderer;
 
     RenderLayer* m_parent;
     RenderLayer* m_previous;
     RenderLayer* m_next;
     RenderLayer* m_first;
     RenderLayer* m_last;
 
     OwnPtr<TransformationMatrix> m_transform;
 
     RenderLayerClipper m_clipper; // FIXME: Lazily allocate?
     OwnPtr<RenderLayerStackingNode> m_stackingNode;
 
     LayoutSize m_subpixelAccumulation; // The accumulated subpixel offset of a composited layer's composited bounds compared to absolute coordinates.
 };
 
 } // namespace blink
 
-#ifndef NDEBUG
-// Outside the WebCore namespace for ease of invocation from gdb.
-void showLayerTree(const blink::RenderLayer*);
-void showLayerTree(const blink::RenderObject*);
-#endif
-
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERLAYER_H_