Added nextIntRange to dartvm and dart2js.

sdk/lib/math/random.dart

 // Copyright (c) 2012, 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.
 
 // A part of the dart:math library.
 
 /**
  * A random number generator. The default implementation supplies a stream of
  * pseudo-random bits which is not suitable for cryptographic purposes.
  */
@@ skipping 10 matching lines @@
   /**
    * Generates a positive random integer uniformly distributed on the range
    * from 0, inclusive, to [max], exclusive.
    *
    * Implementation note: The default implementation supports [max] values
    * between 1 and ((1<<32) - 1) inclusive.
    */
   abstract int nextInt(int max);
 
   /**
+   * Generates a positive random integer uniformly distributed on the range
+   * from [min], inclusive, to [max], exclusive.
+   *
+   * Implementation note: The default implementation supports [max] values
+   * between 1 and ((1<<32) - 1) inclusive. [min] must be greater then 0
+   * and strictly less then [max].
+   */
+  abstract int nextIntRange(int min, int max);
+
+  /**
    * Generates a positive random floating point value uniformly distributed on
    * the range from 0.0, inclusive, to 1.0, exclusive.
    */
   abstract double nextDouble();
 
   /**
    * Generates a random boolean value.
    */
   abstract bool nextBool();
 }