Add Point.origin for new Point(0.0, 0.0)

sky/examples/raw/sector_layout.dart

Index: sky/examples/raw/sector_layout.dart
diff --git a/sky/examples/raw/sector_layout.dart b/sky/examples/raw/sector_layout.dart
index d3186c3c4617ff9a1dc2b0b946ea73be098d5ecc..1c8ed3fdf69ac411360a4cde0c637ab86879e6b2 100644
--- a/sky/examples/raw/sector_layout.dart
+++ b/sky/examples/raw/sector_layout.dart
@@ -257,7 +257,7 @@ class RenderSectorRing extends RenderSectorWithChildren {
     RenderSector child = firstChild;
     while (child != null) {
       assert(child.parentData is SectorChildListParentData);
-      canvas.paintChild(child, new Point(0.0, 0.0));
+      canvas.paintChild(child, Point.origin);
       child = child.parentData.nextSibling;
     }
   }
@@ -362,7 +362,7 @@ class RenderSectorSlice extends RenderSectorWithChildren {
     RenderSector child = firstChild;
     while (child != null) {
       assert(child.parentData is SectorChildListParentData);
-      canvas.paintChild(child, new Point(0.0, 0.0));
+      canvas.paintChild(child, Point.origin);
       child = child.parentData.nextSibling;
     }
   }