Make ~/, round, ceil, floor, truncate return ints. Remove toInt.

samples/swarm/swarm_ui_lib/layout/ViewLayout.dart

Index: samples/swarm/swarm_ui_lib/layout/ViewLayout.dart
diff --git a/samples/swarm/swarm_ui_lib/layout/ViewLayout.dart b/samples/swarm/swarm_ui_lib/layout/ViewLayout.dart
index 4b60138752b86a4e8412c739118fe97b513440ac..973e23c603818e73c7754db291af2733a80f76c9 100644
--- a/samples/swarm/swarm_ui_lib/layout/ViewLayout.dart
+++ b/samples/swarm/swarm_ui_lib/layout/ViewLayout.dart
@@ -229,7 +229,7 @@ class ViewLayout {
     }
     if (style.endsWith('%')) {
       num percent = double.parse(style.substring(0, style.length - 1));
-      return ((percent / 100) * parentSize).toInt();
+      return ((percent / 100) * parentSize).truncate();
     }
     return _toPixels(style);
   }