Split Size into Size and Offset.

sky/examples/stocks2/lib/stock_arrow.dart

 // 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.
 
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/object.dart';
 import 'package:sky/theme/colors.dart' as colors;
@@ skipping 43 matching lines @@
       Path path = new Path();
       path.moveTo(centerX, arrowY - h); // top of the arrow
       path.lineTo(centerX + w, arrowY + h);
       path.lineTo(centerX - w, arrowY + h);
       path.close();
       paint.setStyle(sky.PaintingStyle.fill);
       canvas.drawPath(path, paint);
 
       // Draw a circle that circumscribes the arrow.
       paint.setStyle(sky.PaintingStyle.stroke);
-      canvas.drawCircle(centerX, centerY, r, paint);
+      canvas.drawCircle(new Point(centerX, centerY), r, paint);
     });
 
     return new Container(
       child: arrow,
       width: kSize,
       height: kSize,
       margin: const EdgeDims.symmetric(horizontal: 5.0)
     );
   }
 
 }