Implement a simple checkbox in Sky’s fn2 components library

sky/engine/core/painting/RRect.cpp

 // 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.
 
 #include "sky/engine/config.h"
-#include "sky/engine/core/painting/CanvasPath.h"
+#include "sky/engine/core/painting/RRect.h"
 
 namespace blink {
 
-CanvasPath::CanvasPath()
+RRect::RRect()
 {
 }
 
-CanvasPath::~CanvasPath()
+RRect::~RRect()
 {
 }
 
+void RRect::setRectXY(const Rect& rect, float xRad, float yRad)
+{
+        m_rrect.setRectXY(rect.sk_rect, xRad, yRad);
+}
+
 } // namespace blink