Remove painting roots.

sky/engine/core/rendering/PaintInfo.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 29 matching lines @@
 class RenderInline;
 class RenderLayerModelObject;
 class RenderObject;
 
 /*
  * Paint the object and its children, clipped by (x|y|w|h).
  * (tx|ty) is the calculated position of the parent
  */
 struct PaintInfo {
     PaintInfo(GraphicsContext* newContext, const IntRect& newRect, PaintPhase newPhase,
-        RenderObject* newPaintingRoot, const RenderLayerModelObject* newPaintContainer)
+        const RenderLayerModelObject* newPaintContainer)
         : context(newContext)
         , rect(newRect)
         , phase(newPhase)
-        , paintingRoot(newPaintingRoot)
         , m_paintContainer(newPaintContainer)
     {
     }
 
-    void updatePaintingRootForChildren(const RenderObject* renderer)
-    {
-        if (!paintingRoot)
-            return;
-
-        // If we're the painting root, kids draw normally, and see root of 0.
-        if (paintingRoot == renderer) {
-            paintingRoot = 0;
-            return;
-        }
-    }
-
-    bool shouldPaintWithinRoot(const RenderObject* renderer) const
-    {
-        return !paintingRoot || paintingRoot == renderer;
-    }
-
     void applyTransform(const AffineTransform& localToAncestorTransform, bool identityStatusUnknown = true)
     {
         if (identityStatusUnknown && localToAncestorTransform.isIdentity())
             return;
 
         context->concatCTM(localToAncestorTransform);
 
         if (rect == infiniteRect())
             return;
 
         if (localToAncestorTransform.isInvertible())
             rect = localToAncestorTransform.inverse().mapRect(rect);
         else
             rect.setSize(IntSize(0, 0));
     }
 
     static IntRect infiniteRect() { return IntRect(LayoutRect::infiniteRect()); }
     const RenderLayerModelObject* paintContainer() const { return m_paintContainer; }
 
     // FIXME: Introduce setters/getters at some point. Requires a lot of changes throughout rendering/.
     GraphicsContext* context;
     IntRect rect;
     PaintPhase phase;
-    RenderObject* paintingRoot; // used to draw just one element and its visual kids
 
 private:
     const RenderLayerModelObject* m_paintContainer; // the layer object that originates the current painting
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_PAINTINFO_H_