- Move the Timer interface to the dart:isolate library so that it

runtime/bin/timer.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-interface Timer default _Timer{
-  /**
-   * Creates a new timer. The [callback] callback is invoked after
-   * [milliSeconds] milliseconds.
-   */
-  Timer(int milliSeconds, void callback(Timer timer));
-
-  /**
-   * Creates a new repeating timer. The [callback] is invoked every
-   * [milliSeconds] millisecond until cancelled.
-   */
-  Timer.repeating(int milliSeconds, void callback(Timer timer));
-
-  /**
-   * Cancels the timer.
-   */
-  void cancel();
-}
-