[Slimming Paint] Implement deferred SVG filters

Source/core/rendering/svg/SVGRenderingContext.h

Index: Source/core/rendering/svg/SVGRenderingContext.h
diff --git a/Source/core/rendering/svg/SVGRenderingContext.h b/Source/core/rendering/svg/SVGRenderingContext.h
index 308c17278adec49763f38c76923fef13bd737b71..99131057ec1e65cd7e66d3fecf6df89bc8eea983 100644
--- a/Source/core/rendering/svg/SVGRenderingContext.h
+++ b/Source/core/rendering/svg/SVGRenderingContext.h
@@ -30,6 +30,7 @@
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/svg/RenderSVGResourceClipper.h"
 #include "platform/graphics/paint/ClipPathRecorder.h"
+#include "platform/graphics/paint/DisplayItemList.h"
 #include "platform/transforms/AffineTransform.h"
 
 namespace blink {
@@ -54,6 +55,7 @@ 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)
@@ -90,6 +92,9 @@ private:
 
     RawPtrWillBeMember<RenderObject> m_object;
     PaintInfo m_paintInfo;
+    const PaintInfo* m_originalPaintInfo;
+    OwnPtr<GraphicsContext> m_filterContentGraphicsContext;
+    OwnPtr<DisplayItemList> m_filterContentDisplayItemList;

[chrishtr, 2015/01/24 00:02:02]

Switch this order, so that we are not in a state with a stale pointer in the
destructor of GraphicsContext.

[pdr., 2015/01/24 01:13:36]

Done

     RawPtrWillBeMember<RenderSVGResourceFilter> m_filter;
     RawPtrWillBeMember<RenderSVGResourceClipper> m_clipper;
     RenderSVGResourceClipper::ClipperState m_clipperState;