Fix test.dart on Windows: change all backslashes to slashes eagerly.

tools/testing/dart/test_suite.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.
 
 #library("test_suite");
 
 #import("status_file_parser.dart");
 #import("test_runner.dart");
 #import("multitest.dart");
 
@@ skipping 343 matching lines @@
                           bool isNegative) {
     if (optionsFromFile['isMultitest']) return;
     bool isWebTest = optionsFromFile['containsDomImport'];
     bool isLibraryDefinition = optionsFromFile['isLibraryDefinition'];
     if (!isLibraryDefinition && optionsFromFile['containsSourceOrImport']) {
       print('Warning for $filename: Browser tests require #library ' +
             'in any file that uses #import or #source');
     }
 
     final String component = configuration['component'];
-    final String testPath = new File(filename).fullPathSync();
+    final String testPath =
+        new File(filename).fullPathSync().replaceAll('\\', '/');
 
     for (var vmOptions in optionsFromFile['vmOptions']) {
       // Create a unique temporary directory for each set of vmOptions.
       // TODO(dart:429): Replace separate replaceAlls with a RegExp when
       // replaceAll(RegExp, String) is implemented.
       String optionsName = '';
       if (optionsFromFile['vmOptions'].length > 1) {
           optionsName = Strings.join(vmOptions, '-').replaceAll('-','')
                                                     .replaceAll('=','')
                                                     .replaceAll('/','');
@@ skipping 154 matching lines @@
       }
       buildPath.removeRange(0, 1);
       if (buildPath.last() == '') buildPath.removeLast();
       buildPath.addAll(generatedTestPath);
       generatedTestPath = buildPath;
       tempDir = new Directory(tempDirPath);
       if (!tempDir.existsSync()) {
         tempDir.createSync();
       }
     }
-    tempDirPath = new File(tempDirPath).fullPathSync();
+    tempDirPath = new File(tempDirPath).fullPathSync().replaceAll('\\', '/');
 
     for (String subdirectory in generatedTestPath) {
       tempDirPath = '$tempDirPath/$subdirectory';
       tempDir = new Directory(tempDirPath);
       if (!tempDir.existsSync()) {
         tempDir.createSync();
       }
     }
     return tempDir;
   }
@@ skipping 178 matching lines @@
 
   void activityCompleted() {
     if (--activityCount == 0) {
       directoryListingDone(true);
     }
   }
 
   String shellPath() => TestUtils.compilerPath(configuration);
 
   List<String> additionalOptions(String filename) {
-    filename = new File(filename).fullPathSync();
+    filename = new File(filename).fullPathSync().replaceAll('\\', '/');
     Directory tempDir = createOutputDirectory(filename, 'dartc-test');
     return
         [ '--fatal-warnings', '--fatal-type-errors', 
           '-check-only', '-out', tempDir.path];
   }
 
   void processDirectory() {
     directoryPath = getDirname(directoryPath);
     // Enqueueing the directory listers is an activity.
     activityStarted();
@@ skipping 204 matching lines @@
   static String buildDir(Map configuration) {
     var buildDir = outputDir(configuration);
     buildDir += (configuration['mode'] == 'debug') ? 'Debug_' : 'Release_';
     buildDir += configuration['arch'];
     return buildDir;
   }
 
   static String dartDir() {
     Directory dart;
     if (new File('tools/testing/dart/test_suite.dart').existsSync()) {
-      return new File('.').fullPathSync();
+      return new File('.').fullPathSync().replaceAll('\\', '/');
     } else if (new File('../tools/testing/dart/test_suite.dart').existsSync()) {
-      return new File('..').fullPathSync();
+      return new File('..').fullPathSync().replaceAll('\\', '/');
     } else {
       print('Run test.dart from the dart directory or' +
             ' an immediate subdirectory only.');
       Expect.fail('Could not find top level dart directory.');
     }
   }
 
   static List<String> standardOptions(Map configuration) {
     List args = ["--ignore-unrecognized-flags"];
     if (configuration["checked"]) {
@@ skipping 57 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
 """;
     print(report);
    }
 }