Implement a simple checkbox in Sky’s fn2 components library

sky/engine/core/painting/Canvas.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/Canvas.h"
 
 #include "sky/engine/core/dom/Document.h"
 #include "sky/engine/core/dom/Element.h"
 #include "sky/engine/core/painting/CanvasImage.h"
@@ skipping 97 matching lines @@
 }
 
 void Canvas::clipRect(const Rect& rect)
 {
     if (!m_canvas)
         return;
     ASSERT(m_displayList->isRecording());
     m_canvas->clipRect(rect.sk_rect);
 }
 
+void Canvas::drawLine(float x0, float y0, float x1, float y1, const Paint* paint)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(paint);
+    ASSERT(m_displayList->isRecording());
+    m_canvas->drawLine(x0, y0, x1, y1, paint->paint());
+}
+
 void Canvas::drawPicture(Picture* picture)
 {
     if (!m_canvas)
         return;
     ASSERT(picture);
     ASSERT(m_displayList->isRecording());
     m_canvas->drawPicture(picture->toSkia());
 }
 
 void Canvas::drawPaint(const Paint* paint)
 {
     if (!m_canvas)
         return;
     ASSERT(paint);
     ASSERT(m_displayList->isRecording());
     m_canvas->drawPaint(paint->paint());
 }
 
 void Canvas::drawRect(const Rect& rect, const Paint* paint)
 {
     if (!m_canvas)
         return;
     ASSERT(paint);
     ASSERT(m_displayList->isRecording());
     m_canvas->drawRect(rect.sk_rect, paint->paint());
 }
 
+void Canvas::drawRRect(const RRect* rrect, const Paint* paint)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(rrect);
+    ASSERT(paint);
+    ASSERT(m_displayList->isRecording());
+    m_canvas->drawRRect(rrect->rrect(), paint->paint());
+}
+
 void Canvas::drawOval(const Rect& rect, const Paint* paint)
 {
     if (!m_canvas)
         return;
     ASSERT(paint);
     ASSERT(m_displayList->isRecording());
     m_canvas->drawOval(rect.sk_rect, paint->paint());
 }
 
 void Canvas::drawCircle(float x, float y, float radius, const Paint* paint)
@@ skipping 29 matching lines @@
 PassRefPtr<DisplayList> Canvas::finishRecording()
 {
     if (!isRecording())
         return nullptr;
     m_canvas = nullptr;
     m_displayList->endRecording();
     return m_displayList.release();
 }
 
 } // namespace blink