Oilpan: move SVG property hierarchy to the heap.

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 28 matching lines @@
 public:
     SubtreeContentTransformScope(const AffineTransform&);
     ~SubtreeContentTransformScope();
 
 private:
     AffineTransform m_savedContentTransformation;
 };
 
 // SVGRenderingContext
 class SVGRenderingContext {
+    STACK_ALLOCATED();
 public:
     // Does not start rendering.
     SVGRenderingContext()
         : m_renderingFlags(0)
-        , m_object(0)
-        , m_paintInfo(0)
-        , m_savedContext(0)
-        , m_filter(0)
-        , m_clipper(0)
+        , m_object(nullptr)
+        , m_paintInfo(nullptr)
+        , m_savedContext(nullptr)
+        , m_filter(nullptr)
+        , m_clipper(nullptr)
         , m_clipperState(RenderSVGResourceClipper::ClipperNotApplied)
-        , m_masker(0)
+        , m_masker(nullptr)
     {
     }
 
     SVGRenderingContext(RenderObject* object, PaintInfo& paintinfo)
         : m_renderingFlags(0)
-        , m_object(0)
-        , m_paintInfo(0)
-        , m_savedContext(0)
-        , m_filter(0)
-        , m_clipper(0)
+        , m_object(nullptr)
+        , m_paintInfo(nullptr)
+        , m_savedContext(nullptr)
+        , m_filter(nullptr)
+        , m_clipper(nullptr)
         , m_clipperState(RenderSVGResourceClipper::ClipperNotApplied)
-        , m_masker(0)
+        , m_masker(nullptr)
     {
         prepareToRenderSVGContent(object, paintinfo);
     }
 
     // Automatically finishes context rendering.
     ~SVGRenderingContext();
 
     // Used by all SVG renderers who apply clip/filter/etc. resources to the renderer content.
     void prepareToRenderSVGContent(RenderObject*, PaintInfo&);
     bool isRenderingPrepared() const { return m_renderingFlags & RenderingPrepared; }
 
     static void renderSubtree(GraphicsContext*, RenderObject*);
 
     static float calculateScreenFontSizeScalingFactor(const RenderObject*);
 
 private:
     // To properly revert partially successful initializtions in the destructor, we record all successful steps.
     enum RenderingFlags {
         RenderingPrepared = 1,
         RestoreGraphicsContext = 1 << 1,
         EndOpacityLayer = 1 << 2,
         PostApplyResources = 1 << 3,
         PrepareToRenderSVGContentWasCalled = 1 << 4
     };
 
     // List of those flags which require actions during the destructor.
     const static int ActionsNeeded = RestoreGraphicsContext | EndOpacityLayer | PostApplyResources;
 
     int m_renderingFlags;
-    RenderObject* m_object;
+    RawPtrWillBeMember<RenderObject> m_object;
     PaintInfo* m_paintInfo;
     GraphicsContext* m_savedContext;
     IntRect m_savedPaintRect;
-    RenderSVGResourceFilter* m_filter;
-    RenderSVGResourceClipper* m_clipper;
+    RawPtrWillBeMember<RenderSVGResourceFilter> m_filter;
+    RawPtrWillBeMember<RenderSVGResourceClipper> m_clipper;
     RenderSVGResourceClipper::ClipperState m_clipperState;
-    RenderSVGResourceMasker* m_masker;
+    RawPtrWillBeMember<RenderSVGResourceMasker> m_masker;
 };
 
 } // namespace blink
 
 #endif // SVGRenderingContext_h