Pass more const RenderObject& in the vicinity of paint-servers

Source/core/rendering/svg/RenderSVGResource.h

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 36 matching lines @@
 class RenderObject;
 class RenderStyle;
 class RenderSVGResourceSolidColor;
 
 class SVGPaintServer {
 public:
     explicit SVGPaintServer(Color);
     explicit SVGPaintServer(PassRefPtr<Gradient>);
     explicit SVGPaintServer(PassRefPtr<Pattern>);
 
-    static SVGPaintServer requestForRenderer(RenderObject&, RenderStyle*, RenderSVGResourceMode);
+    static SVGPaintServer requestForRenderer(const RenderObject&, const RenderStyle*, RenderSVGResourceMode);
 
     void apply(GraphicsContext&, RenderSVGResourceMode, GraphicsContextStateSaver* = 0);
 
     static SVGPaintServer invalid() { return SVGPaintServer(Color(Color::transparent)); }
     bool isValid() const { return m_color != Color::transparent; }
 
     bool isTransformDependent() const { return m_gradient || m_pattern; }
     void prependTransform(const AffineTransform&);
 
 private:
     RefPtr<Gradient> m_gradient;
     RefPtr<Pattern> m_pattern;
     Color m_color;
 };
 
 class RenderSVGResource {
 public:
     RenderSVGResource() { }
     virtual ~RenderSVGResource() { }
 
-    virtual SVGPaintServer preparePaintServer(RenderObject*);
+    virtual SVGPaintServer preparePaintServer(const RenderObject&);
 
     virtual RenderSVGResourceType resourceType() const = 0;
 
     // Helper utilities used in the render tree to access resources used for painting shapes/text (gradients & patterns & solid colors only)
     // If hasFallback gets set to true, the sharedSolidPaintingResource is set to a fallback color.
-    static RenderSVGResource* requestPaintingResource(RenderSVGResourceMode, RenderObject*, const RenderStyle*, bool& hasFallback);
+    static RenderSVGResource* requestPaintingResource(RenderSVGResourceMode, const RenderObject&, const RenderStyle*, bool& hasFallback);
     static RenderSVGResourceSolidColor* sharedSolidPaintingResource();
 
     static void markForLayoutAndParentResourceInvalidation(RenderObject*, bool needsLayout = true);
 };
 
 #define DEFINE_RENDER_SVG_RESOURCE_TYPE_CASTS(thisType, typeName) \
     DEFINE_TYPE_CASTS(thisType, RenderSVGResource, resource, resource->resourceType() == typeName, resource.resourceType() == typeName)
 
 }
 
 #endif