Clip inkwell splash around the floating action button

sky/engine/core/painting/Canvas.h

Index: sky/engine/core/painting/Canvas.h
diff --git a/sky/engine/core/painting/Canvas.h b/sky/engine/core/painting/Canvas.h
index 8a768f2d8d7f998ce61c5edc19239c1179c465fd..abd325643ec8188ffcf6a0feb467d3ef19f0d020 100644
--- a/sky/engine/core/painting/Canvas.h
+++ b/sky/engine/core/painting/Canvas.h
@@ -32,7 +32,7 @@ public:
     float height() const { return m_size.height(); }
 
     void save();
-    void saveLayer(const Rect& bounds, const Paint* paint);
+    void saveLayer(const Rect& bounds, const Paint* paint = nullptr);
     void restore();
 
     void translate(float dx, float dy);
@@ -42,6 +42,8 @@ public:
     void concat(const Float32List& matrix4);
 
     void clipRect(const Rect& rect);
+    void clipRRect(const RRect* rrect);
+    void clipPath(const CanvasPath* path);
 
     void drawLine(float x0, float y0, float x1, float y1, const Paint* paint);
     void drawPicture(Picture* picture);