[Slimming Paint] Implement deferred SVG filters

Source/core/rendering/svg/SVGRenderingContext.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2012 Zoltan Herczeg <zherczeg@webkit.org>.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 36 matching lines @@
 private:
     AffineTransform m_savedContentTransformation;
 };
 
 class SVGRenderingContext {
     STACK_ALLOCATED();
 public:
     SVGRenderingContext(RenderObject& object, const PaintInfo& paintInfo)
         : m_object(&object)
         , m_paintInfo(paintInfo)
+        , m_originalPaintInfo(&paintInfo)
         , m_filter(nullptr)
         , m_clipper(nullptr)
         , m_clipperState(RenderSVGResourceClipper::ClipperNotApplied)
         , m_masker(nullptr)
 #if ENABLE(ASSERT)
         , m_applyClipMaskAndFilterIfNecessaryCalled(false)
 #endif
     { }
 
     ~SVGRenderingContext();
@@ skipping 16 matching lines @@
     // Return true if no masking is necessary or if the mask is successfully applied.
     bool applyMaskIfNecessary(SVGResources*);
 
     // Return true if no filtering is necessary or if the filter is successfully applied.
     bool applyFilterIfNecessary(SVGResources*);
 
     bool isIsolationInstalled() const;
 
     RawPtrWillBeMember<RenderObject> m_object;
     PaintInfo m_paintInfo;
+    const PaintInfo* m_originalPaintInfo;
     RawPtrWillBeMember<RenderSVGResourceFilter> m_filter;
     RawPtrWillBeMember<RenderSVGResourceClipper> m_clipper;
     RenderSVGResourceClipper::ClipperState m_clipperState;
     RawPtrWillBeMember<RenderSVGResourceMasker> m_masker;
     OwnPtr<CompositingRecorder> m_compositingRecorder;
     OwnPtr<FloatClipRecorder> m_clipRecorder;
     OwnPtr<ClipPathRecorder> m_clipPathRecorder;
 #if ENABLE(ASSERT)
     bool m_applyClipMaskAndFilterIfNecessaryCalled;
 #endif
 };
 
 } // namespace blink
 
 #endif // SVGRenderingContext_h