Stateful BoxBorderPainter

Source/platform/geometry/FloatRoundedRect.h

Index: Source/platform/geometry/FloatRoundedRect.h
diff --git a/Source/platform/geometry/FloatRoundedRect.h b/Source/platform/geometry/FloatRoundedRect.h
index de1529d6fd24be4cd230ca5cde47af74f6404872..491f724d975640d62c324f701dd9fbf5fac3816d 100644
--- a/Source/platform/geometry/FloatRoundedRect.h
+++ b/Source/platform/geometry/FloatRoundedRect.h
@@ -94,6 +94,7 @@ public:
         FloatSize m_bottomRight;
     };
 
+    FloatRoundedRect() { }
     explicit FloatRoundedRect(const FloatRect&, const Radii& = Radii());
     FloatRoundedRect(float x, float y, float width, float height);
     FloatRoundedRect(const FloatRect&, const FloatSize& topLeft, const FloatSize& topRight, const FloatSize& bottomLeft, const FloatSize& bottomRight);