Implement interfaces in PaintInfo and make it a class.

Source/core/rendering/svg/RenderSVGResourceMarker.cpp

Index: Source/core/rendering/svg/RenderSVGResourceMarker.cpp
diff --git a/Source/core/rendering/svg/RenderSVGResourceMarker.cpp b/Source/core/rendering/svg/RenderSVGResourceMarker.cpp
index 3a9cead138a1cdeb60a1eed190cf53f4c6bd20ae..4b606ca23d2f2950993109789c1dad863e39392b 100644
--- a/Source/core/rendering/svg/RenderSVGResourceMarker.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourceMarker.cpp
@@ -71,7 +71,7 @@ void RenderSVGResourceMarker::removeClientFromCache(RenderObject* client, bool m
 void RenderSVGResourceMarker::applyViewportClip(PaintInfo& paintInfo)
 {
     if (SVGRenderSupport::isOverflowHidden(this))
-        paintInfo.context->clip(m_viewport);
+        paintInfo.getContext()->clip(m_viewport);
 }
 
 FloatRect RenderSVGResourceMarker::markerBoundaries(const AffineTransform& markerTransformation) const
@@ -137,7 +137,7 @@ void RenderSVGResourceMarker::draw(PaintInfo& paintInfo, const AffineTransform&
         return;
 
     PaintInfo info(paintInfo);
-    GraphicsContextStateSaver stateSaver(*info.context);
+    GraphicsContextStateSaver stateSaver(*(info.getContext()));
     info.applyTransform(transform);
     RenderSVGContainer::paint(info, IntPoint());
 }