Make round-caps line segments convex

src/core/SkStrokerPriv.cpp

Index: src/core/SkStrokerPriv.cpp
diff --git a/src/core/SkStrokerPriv.cpp b/src/core/SkStrokerPriv.cpp
index 52144cdc5fc18bca2469d8d904697f1448d54bd7..b7eba67411fb83345623d1f5a3c2b83a2d23017b 100644
--- a/src/core/SkStrokerPriv.cpp
+++ b/src/core/SkStrokerPriv.cpp
@@ -21,8 +21,8 @@ static void RoundCapper(SkPath* path, const SkPoint& pivot, const SkVector& norm
 
     SkPoint projectedCenter = pivot + parallel;
 
-    path->conicTo(projectedCenter + normal, projectedCenter, SK_ScalarRoot2Over2);
-    path->conicTo(projectedCenter - normal, stop, SK_ScalarRoot2Over2);
+    path->conicTo(pivot + (parallel + normal) * 0.999, projectedCenter, SK_ScalarRoot2Over2);
+    path->conicTo(pivot + (parallel - normal) * 0.999, stop, SK_ScalarRoot2Over2);
 }
 
 static void SquareCapper(SkPath* path, const SkPoint& pivot, const SkVector& normal,