Separate repaint and layout requirements of StyleDifference (Step 1)

Source/core/rendering/style/SVGRenderStyle.h

Index: Source/core/rendering/style/SVGRenderStyle.h
diff --git a/Source/core/rendering/style/SVGRenderStyle.h b/Source/core/rendering/style/SVGRenderStyle.h
index e7347c7c0288331ec879072e36d6e8e32936a071..987ea252bcc6a9f4652a8611b5a3f4414112c242 100644
--- a/Source/core/rendering/style/SVGRenderStyle.h
+++ b/Source/core/rendering/style/SVGRenderStyle.h
@@ -28,6 +28,7 @@
 #include "core/rendering/style/DataRef.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "core/rendering/style/SVGRenderStyleDefs.h"
+#include "core/rendering/style/StyleDifference.h"
 #include "core/svg/SVGPaint.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/Path.h"
@@ -427,6 +428,9 @@ private:
     SVGRenderStyle(const SVGRenderStyle&);
     SVGRenderStyle(CreateDefaultType); // Used to create the default style.
 
+    bool diffNeedsLayoutAndRepaint(const SVGRenderStyle* other) const;
+    bool diffNeedsRepaintOnly(const SVGRenderStyle* other) const;
+
     void setBitDefaults()
     {
         svg_inherited_flags._clipRule = initialClipRule();