Move <svg:image> buffered-rendering management to SVGImagePainter

Source/core/paint/SVGImagePainter.h

Index: Source/core/paint/SVGImagePainter.h
diff --git a/Source/core/paint/SVGImagePainter.h b/Source/core/paint/SVGImagePainter.h
index 33be3ac6f64b00a23ca85135f3e019a4bee7477c..955988683aa87ae39d8d3f31d2190d96b370da5b 100644
--- a/Source/core/paint/SVGImagePainter.h
+++ b/Source/core/paint/SVGImagePainter.h
@@ -7,6 +7,10 @@
 
 namespace blink {
 
+class AffineTransform;
+class FloatRect;
+class ImageBuffer;
+class IntSize;
 struct PaintInfo;
 class RenderSVGImage;
 
@@ -16,10 +20,11 @@ public:
 
     void paint(PaintInfo&);
 
+private:
+    bool bufferForeground(PaintInfo&);
     // Assumes the PaintInfo context has had all local transforms applied.
-    static void paintForeground(RenderSVGImage&, PaintInfo&);
+    void paintForeground(PaintInfo&);
 
-private:
     RenderSVGImage& m_renderSVGImage;
 };