Introduce a VM-only dart:scalarlist library for byte arrays.

tests/standalone/byte_array_test.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 //
 // Dart test program for testing native byte arrays.
 
+#import('dart:scalarlist');
+
 void testCreateByteArray() {
   Uint8List byteArray;
 
   byteArray = new Uint8List(0);
   Expect.equals(0, byteArray.length);
 
   byteArray = new Uint8List(10);
   Expect.equals(10, byteArray.length);
   for (int i = 0; i < 10; i++) {
     Expect.equals(0, byteArray[i]);
@@ skipping 57 matching lines @@
 }
 
 main() {
   for (int i = 0; i < 2000; i++) {
     testCreateByteArray();
     testSetRange();
     testIndexOutOfRange();
     testIndexOf();
   }
 }