Extension method support to move us closer to a valid List implementation.

tool/input_sdk/lib/core/list.dart

Index: tool/input_sdk/lib/core/list.dart
diff --git a/tool/input_sdk/lib/core/list.dart b/tool/input_sdk/lib/core/list.dart
index d4f6cfac81d7ac9122b1edbaf971d03b31d1915b..2ce69e1667da21e7931e101de92b435e64218996 100644
--- a/tool/input_sdk/lib/core/list.dart
+++ b/tool/input_sdk/lib/core/list.dart
@@ -51,7 +51,10 @@ part of dart.core;
  * directly or through iterating an [Iterable] that is backed by the list, will
  * break the iteration.
  */
+@SupportJsExtensionMethod()
+@JsPeerInterface(name: 'Array')
 abstract class List<E> implements Iterable<E>, EfficientLength {
+  // Method that needs to be mixed in to all Dart subclasses that implement

[vsm, 2015/04/03 16:41:20]

I don't understand this comment.

[Jacob, 2015/04/03 20:25:59]

removed.

   /**
    * Creates a list of the given length.
    *