Remove more scrolling code from Sky

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 221 matching lines @@
             RenderLayerFilterInfo::removeFilterInfoForRenderLayer(this);
     }
 
     bool hasFilterInfo() const { return m_hasFilterInfo; }
     void setHasFilterInfo(bool hasFilterInfo) { m_hasFilterInfo = hasFilterInfo; }
 
     void updateFilters(const RenderStyle* oldStyle, const RenderStyle* newStyle);
 
     Node* enclosingElement() const;
 
-    bool scrollsWithRespectTo(const RenderLayer*) const;
-
     RenderLayerClipper& clipper() { return m_clipper; }
     const RenderLayerClipper& clipper() const { return m_clipper; }
 
     inline bool isPositionedContainer() const
     {
         // FIXME: This is not in sync with containingBlock.
         RenderLayerModelObject* layerRenderer = renderer();
         return isRootLayer() || layerRenderer->isPositioned() || hasTransform();
     }
 
     class AncestorDependentCompositingInputs {
     public:
         AncestorDependentCompositingInputs()
             : opacityAncestor(0)
             , transformAncestor(0)
             , filterAncestor(0)
             , clippingContainer(0)
-            , ancestorScrollingLayer(0)
-            , scrollParent(0)
             , clipParent(0)
             , isUnclippedDescendant(false)
             , hasAncestorWithClipPath(false)
         { }
 
         IntRect clippedAbsoluteBoundingBox;
         const RenderLayer* opacityAncestor;
         const RenderLayer* transformAncestor;
         const RenderLayer* filterAncestor;
         const RenderObject* clippingContainer;
-        const RenderLayer* ancestorScrollingLayer;
-
-        // A scroll parent is a compositor concept. It's only needed in blink
-        // because we need to use it as a promotion trigger. A layer has a
-        // scroll parent if neither its compositor scrolling ancestor, nor any
-        // other layer scrolled by this ancestor, is a stacking ancestor of this
-        // layer. Layers with scroll parents must be scrolled with the main
-        // scrolling layer by the compositor.
-        const RenderLayer* scrollParent;
 
         // A clip parent is another compositor concept that has leaked into
         // blink so that it may be used as a promotion trigger. Layers with clip
         // parents escape the clip of a stacking tree ancestor. The compositor
         // needs to know about clip parents in order to circumvent its normal
         // clipping logic.
         const RenderLayer* clipParent;
 
         // The "is unclipped descendant" concept is now only being used for one
         // purpose: when traversing the RenderLayers in stacking order, we check
@@ skipping 33 matching lines @@
     void updateDescendantDependentCompositingInputs(const DescendantDependentCompositingInputs&);
 
     const AncestorDependentCompositingInputs& ancestorDependentCompositingInputs() const { ASSERT(!m_needsAncestorDependentCompositingInputsUpdate); return m_ancestorDependentCompositingInputs; }
     const DescendantDependentCompositingInputs& descendantDependentCompositingInputs() const { ASSERT(!m_needsDescendantDependentCompositingInputsUpdate); return m_descendantDependentCompositingInputs; }
 
     IntRect clippedAbsoluteBoundingBox() const { return ancestorDependentCompositingInputs().clippedAbsoluteBoundingBox; }
     const RenderLayer* opacityAncestor() const { return ancestorDependentCompositingInputs().opacityAncestor; }
     const RenderLayer* transformAncestor() const { return ancestorDependentCompositingInputs().transformAncestor; }
     const RenderLayer* filterAncestor() const { return ancestorDependentCompositingInputs().filterAncestor; }
     const RenderObject* clippingContainer() const { return ancestorDependentCompositingInputs().clippingContainer; }
-    const RenderLayer* ancestorScrollingLayer() const { return ancestorDependentCompositingInputs().ancestorScrollingLayer; }
-    RenderLayer* scrollParent() const { return const_cast<RenderLayer*>(ancestorDependentCompositingInputs().scrollParent); }
     RenderLayer* clipParent() const { return const_cast<RenderLayer*>(ancestorDependentCompositingInputs().clipParent); }
     bool isUnclippedDescendant() const { return ancestorDependentCompositingInputs().isUnclippedDescendant; }
     bool hasAncestorWithClipPath() const { return ancestorDependentCompositingInputs().hasAncestorWithClipPath; }
     bool hasDescendantWithClipPath() const { return descendantDependentCompositingInputs().hasDescendantWithClipPath; }
 
     bool lostGroupedMapping() const { return m_lostGroupedMapping; }
     void setLostGroupedMapping(bool b) { m_lostGroupedMapping = b; }
 
     bool hasCompositingDescendant() const { return m_hasCompositingDescendant; }
     void setHasCompositingDescendant(bool);
@@ skipping 151 matching lines @@
 
 } // 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_