Change the ColorFilter constructor to ColorFilter.Mode, in case we want to add

sky/examples/game/lib/sprite_node.dart

Index: sky/examples/game/lib/sprite_node.dart
diff --git a/sky/examples/game/lib/sprite_node.dart b/sky/examples/game/lib/sprite_node.dart
index 406a3f4ab442a98a546e816a7af5dc5c21767e8f..327f5e028c63fe865b41cdc171580911012e2668 100644
--- a/sky/examples/game/lib/sprite_node.dart
+++ b/sky/examples/game/lib/sprite_node.dart
@@ -52,7 +52,7 @@ class SpriteNode extends TransformNode {
       Paint paint = new Paint();
       paint.setARGB((255.0*_opacity).toInt(), 255, 255, 255);
       if (colorOverlay != null) {
-        paint.setColorFilter(new ColorFilter(colorOverlay, TransferMode.srcATopMode));
+        paint.setColorFilter(new ColorFilter.Mode(colorOverlay, TransferMode.srcATopMode));
       }
       if (transferMode != null) {
         paint.setTransferMode(transferMode);
@@ -68,4 +68,4 @@ class SpriteNode extends TransformNode {
     }
   }
   
-}
+}