Should not use clipOutRoundedRect when a given rounded rect is empty.

Source/core/rendering/RenderBoxModelObject.cpp

Index: Source/core/rendering/RenderBoxModelObject.cpp
diff --git a/Source/core/rendering/RenderBoxModelObject.cpp b/Source/core/rendering/RenderBoxModelObject.cpp
index 05f26bcdeaf193be0d16b491bb6e15f74641456e..e441a9926de41dd291f2aae2d595e9f18c9cc6fe 100644
--- a/Source/core/rendering/RenderBoxModelObject.cpp
+++ b/Source/core/rendering/RenderBoxModelObject.cpp
@@ -1885,7 +1885,7 @@ void RenderBoxModelObject::paintBorder(const PaintInfo& info, const LayoutRect&
             graphicsContext->clipRoundedRect(outerBorder);
         // isRenderable() check avoids issue described in https://bugs.webkit.org/show_bug.cgi?id=38787
         // The inside will be clipped out later (in clipBorderSideForComplexInnerPath)
-        if (innerBorder.isRenderable())
+        if (innerBorder.isRenderable() && !innerBorder.isEmpty())
             graphicsContext->clipOutRoundedRect(innerBorder);
     }
 
@@ -2349,7 +2349,9 @@ void RenderBoxModelObject::clipBorderSideForComplexInnerPath(GraphicsContext* gr
     BoxSide side, const class BorderEdge edges[])
 {
     graphicsContext->clip(calculateSideRectIncludingInner(outerBorder, edges, side));
-    graphicsContext->clipOutRoundedRect(calculateAdjustedInnerBorder(innerBorder, side));
+    RoundedRect adjustedInnerRect = calculateAdjustedInnerBorder(innerBorder, side);
+    if (!adjustedInnerRect.isEmpty())
+        graphicsContext->clipOutRoundedRect(adjustedInnerRect);
 }
 
 void RenderBoxModelObject::getBorderEdgeInfo(BorderEdge edges[], const RenderStyle* style, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const