Split Size into Size and Offset.

sky/sdk/lib/widgets/radio.dart

Index: sky/sdk/lib/widgets/radio.dart
diff --git a/sky/sdk/lib/widgets/radio.dart b/sky/sdk/lib/widgets/radio.dart
index 8ac96433d5a34c0d0b4513abeffaebd450279a4e..eb82dfd0a5bc961ded58fc78df2aab3155c6708e 100644
--- a/sky/sdk/lib/widgets/radio.dart
+++ b/sky/sdk/lib/widgets/radio.dart
@@ -50,12 +50,12 @@ class Radio extends ButtonBase {
             // Draw the outer circle
             paint.setStyle(sky.PaintingStyle.stroke);
             paint.strokeWidth = 2.0;
-            canvas.drawCircle(kOuterRadius, kOuterRadius, kOuterRadius, paint);
+            canvas.drawCircle(const Point(kOuterRadius, kOuterRadius), kOuterRadius, paint);
 
             // Draw the inner circle
             if (value == groupValue) {
               paint.setStyle(sky.PaintingStyle.fill);
-              canvas.drawCircle(kOuterRadius, kOuterRadius, kInnerRadius, paint);
+              canvas.drawCircle(const Point(kOuterRadius, kOuterRadius), kInnerRadius, paint);
             }
           }
         )