Clip inkwell splash around the floating action button

sky/engine/core/painting/CanvasPath.h

Index: sky/engine/core/painting/CanvasPath.h
diff --git a/sky/engine/core/painting/CanvasPath.h b/sky/engine/core/painting/CanvasPath.h
index 1bffeda340704549617af5ee58c0e97358b9ddf7..29520617d5e971d3ff1190864dda095a0c402e5f 100644
--- a/sky/engine/core/painting/CanvasPath.h
+++ b/sky/engine/core/painting/CanvasPath.h
@@ -43,6 +43,11 @@ public:
         m_path.arcTo(rect.sk_rect, startAngle*180.0/M_PI, sweepAngle*180.0/M_PI, forceMoveTo);
     }
 
+    void addOval(const Rect& oval)
+    {
+        m_path.addOval(oval.sk_rect);
+    }
+
     void close()
     {
         m_path.close();