List.mappedBy/skip/take returns a List.

sdk/lib/collection_dev/list.dart

Index: sdk/lib/collection_dev/list.dart
diff --git a/sdk/lib/collection_dev/list.dart b/sdk/lib/collection_dev/list.dart
index 4dc698a16762d1f892d4ea83d5ffeeb9bcc76b3a..10facd6bc62c6a0ed059d7f90609659697108d2c 100644
--- a/sdk/lib/collection_dev/list.dart
+++ b/sdk/lib/collection_dev/list.dart
@@ -10,7 +10,7 @@ part of dart.collection.dev;
  * Implements all read-only operations, except [:operator[]:] and [:length:],
  * in terms of those two operations.
  */
-abstract class ListBase<E> extends Iterable<E> implements List<E> {
+abstract class ListBase<E> extends Collection<E> implements List<E> {
   Iterator<E> get iterator => new ListIterator(this);
 
   void forEach(f(E element)) {
@@ -93,6 +93,18 @@ abstract class ListBase<E> extends Iterable<E> implements List<E> {
     return result;
   }
 
+  List mappedBy(f(E element)) {
+    return new MappedList(this, f);
+  }
+
+  List<E> take(int n) {
+    return new ListView(this, 0, n);
+  }
+
+  List<E> skip(int n) {
+    return new ListView(this, n, null);
+  }
+
   String toString() => Collections.collectionToString(this);
 }