Not properly handling backslashes for extra files on Windows.

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
===================================================================
--- tools/testing/dart/test_suite.dart	(revision 5355)
+++ tools/testing/dart/test_suite.dart	(working copy)
@@ -528,6 +528,9 @@
         List<String> otherScripts = optionsFromFile['otherScripts'];
         for (String name in otherScripts) {
           int end = filename.lastIndexOf('/');
+          if (new Platform().operatingSystem() == 'windows' && end == -1) {

[Siggi Cherem (dart-lang), 2012/03/12 20:44:08]

seems odd though - the filenames come from a string annotation, they are not
processed or generated by any dart:io API

+            end = filename.lastIndexOf('\\');
+          }
           if (end == -1) {
             print('Warning: error processing "OtherScripts" of $filename.');
             print('Skipping test ($testName).');