Introduce SVGPaintServer

Source/core/rendering/svg/SVGRenderSupport.h

Index: Source/core/rendering/svg/SVGRenderSupport.h
diff --git a/Source/core/rendering/svg/SVGRenderSupport.h b/Source/core/rendering/svg/SVGRenderSupport.h
index 7419f4a7fc36e44992afe18d2c1b15cc0a2f0083..d3133030fb7e564239cc0a2c06860b9e9ab788b2 100644
--- a/Source/core/rendering/svg/SVGRenderSupport.h
+++ b/Source/core/rendering/svg/SVGRenderSupport.h
@@ -30,6 +30,7 @@ class AffineTransform;
 class FloatPoint;
 class FloatRect;
 class GraphicsContext;
+class GraphicsContextStateSaver;
 class PaintInvalidationState;
 class LayoutRect;
 struct PaintInfo;
@@ -84,6 +85,11 @@ public:
     static void applyStrokeStyleToContext(GraphicsContext*, const RenderStyle*, const RenderObject*);
     static void applyStrokeStyleToStrokeData(StrokeData*, const RenderStyle*, const RenderObject*);
 
+    // Update the GC state (on |stateSaver.context()|) for painting |renderer|
+    // using |style|. |resourceModeFlags| is used to decide between fill/stroke.
+    // Previous state will be saved (if needed) using |stateSaver|.
+    static bool updateGraphicsContext(GraphicsContextStateSaver&, RenderStyle*, RenderObject&, unsigned resourceModeFlags);
+
     // Fill and/or stroke the provided |path|.
     static void fillOrStrokePath(GraphicsContext*, unsigned short resourceMode, const Path&);