Clip inkwell splash around the floating action button

sky/engine/core/painting/Canvas.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 #define SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 
 #include "sky/engine/core/painting/CanvasPath.h"
 #include "sky/engine/core/painting/Paint.h"
 #include "sky/engine/core/painting/Picture.h"
@@ skipping 14 matching lines @@
 public:
     Canvas(const FloatSize& size);
     ~Canvas() override;
 
     // Width/Height define a culling rect which Skia may use for optimizing
     // out draw calls issued outside the rect.
     float width() const { return m_size.width(); }
     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);
     void scale(float sx, float sy);
     void rotate(float radians);
     void skew(float sx, float sy);
     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);
     void drawPaint(const Paint* paint);
     void drawRect(const Rect& rect, const Paint* paint);
     void drawRRect(const RRect* rrect, const Paint* paint);
     void drawOval(const Rect& rect, const Paint* paint);
     void drawCircle(float x, float y, float radius, const Paint* paint);
     void drawPath(const CanvasPath* path, const Paint* paint);
     void drawImage(const CanvasImage* image,
@@ skipping 10 matching lines @@
 
 private:
     FloatSize m_size;
     RefPtr<DisplayList> m_displayList;
     SkCanvas* m_canvas;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_PAINTING_CANVAS_H_