Add Iterable.range, List.range and int.to.

sdk/lib/core/int.dart

Index: sdk/lib/core/int.dart
diff --git a/sdk/lib/core/int.dart b/sdk/lib/core/int.dart
index 173356885e24cbff22684a06c5825899d93e22c3..a973f7f7c1ef1e5a871490fb75955997d7adeb9d 100644
--- a/sdk/lib/core/int.dart
+++ b/sdk/lib/core/int.dart
@@ -275,4 +275,21 @@ abstract class int extends num {
   external static int parse(String source,
                             { int radix,
                               int onError(String source) });
+
+  /**
+   * Create an `Iterable<int>` iterating from `this` to `to`, inclusive.
+   *
+   * The iteration starts with `this` as the first value, and then
+   * progresses towards `to` in increments of `step`, and stops when reaching
+   * or overshooting `to`. If it hits `to` the `to` value is included,
+   * otherwise it isn't.
+   *
+   * If `to` is less than `from`, the values are in decreasing order.
+   *
+   * The [step] value must always be positive. It defaults to `1`.
+   *
+   * This is a shorthand for [Iterable.range].
+   */
+  static Iterable<int> to(int to, {int step: 1}) =>
+      return Iterable.range(this, to, step);
 }