Introduce SVGPaintServer

Source/core/rendering/svg/RenderSVGResourceGradient.h

Index: Source/core/rendering/svg/RenderSVGResourceGradient.h
diff --git a/Source/core/rendering/svg/RenderSVGResourceGradient.h b/Source/core/rendering/svg/RenderSVGResourceGradient.h
index f3e02e31c41ca680c34d967568f3794cdcd5f0a1..5b1b131f0adb33f0c8623b3249c938f1d3d58b75 100644
--- a/Source/core/rendering/svg/RenderSVGResourceGradient.h
+++ b/Source/core/rendering/svg/RenderSVGResourceGradient.h
@@ -26,7 +26,6 @@
 #include "core/svg/SVGGradientElement.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/Gradient.h"
-#include "platform/graphics/ImageBuffer.h"
 #include "platform/transforms/AffineTransform.h"
 #include "wtf/HashMap.h"
 
@@ -48,8 +47,7 @@ public:
     virtual void removeAllClientsFromCache(bool markForInvalidation = true) override final;
     virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true) override final;
 
-    virtual bool applyResource(RenderObject*, RenderStyle*, GraphicsContext*, RenderSVGResourceModeFlags) override final;
-    virtual void postApplyResource(GraphicsContext*) override final;
+    virtual SVGPaintServer preparePaintServer(RenderObject*, RenderStyle*, RenderSVGResourceModeFlags) override final;
 
     virtual bool isChildAllowed(RenderObject* child, RenderStyle*) const override final;