Introduce sky.Sky.zero

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 7b5d6dd391a216a0b4a040a8a5b45bf0cfa22eb5..b02dcadc8353ba0e020a43df7876d521ccf482fb 100644
--- a/sky/examples/raw/sector_layout.dart
+++ b/sky/examples/raw/sector_layout.dart
@@ -401,7 +401,7 @@ class RenderBoxToRenderSectorAdapter extends RenderBox {
 
   sky.Size getIntrinsicDimensions(BoxConstraints constraints) {
     if (child == null)
-      return constraints.constrain(new sky.Size(0.0, 0.0));
+      return constraints.constrain(sky.Size.zero);

[Hixie, 2015/06/08 17:01:53]

You should be able to remove the sky. part now.

     assert(child is RenderSector);
     assert(child.parentData is SectorParentData);
     assert(!constraints.isInfinite);
@@ -413,7 +413,7 @@ class RenderBoxToRenderSectorAdapter extends RenderBox {
 
   void performLayout() {
     if (child == null) {
-      size = constraints.constrain(new sky.Size(0.0, 0.0));
+      size = constraints.constrain(sky.Size.zero);
     } else {
       assert(child is RenderSector);
       assert(!constraints.isInfinite);