Change dart:io Platform.script to return a Uri.

tools/dom/docs/test/docs_test.dart

 // Copyright (c) 2013, 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 docs_test;
 
 import 'dart:io';
 
 import 'package:unittest/unittest.dart';
 import 'package:path/path.dart' as path;
 
 import '../bin/docs.dart';
 import '../lib/docs.dart';
 
-final testJsonPath = path.normalize(path.join(scriptDir, 'test.json'));
+final testJsonPath = Platform.script.resolve('test.json').toFilePath();
 
 main() {
   // Some tests take more than the default 20 second unittest timeout.
   unittestConfiguration.timeout = null;
   group('docs', () {
     var oldJson = new File(json_path);
     var testJson = new File(testJsonPath);
 
     tearDown(() {
       // Clean up.
       if (testJson.existsSync()) {
         testJson.deleteSync();
       }
       assert(!testJson.existsSync());
     });
 
     test('Ensure that docs.json is up to date', () {
       // We should find a json file where we expect it.
       expect(oldJson.existsSync(), isTrue);
 
       // Save the last modified time to check it at the end.
       var oldJsonModified = oldJson.lastModifiedSync();
 
       // There should be no test file yet.
       if (testJson.existsSync()) testJson.deleteSync();
       assert(!testJson.existsSync());
 
-      expect(convert(lib_path, testJsonPath)
+      expect(convert(lib_uri, testJsonPath)
           .then((bool anyErrors) {
         expect(anyErrors, isFalse);
 
         // We should have a file now.
         expect(testJson.existsSync(), isTrue);
 
         // Ensure that there's nothing different between the new JSON and old.
         expect(testJson.readAsStringSync(), equals(oldJson.readAsStringSync()));
 
         // Ensure that the old JSON file didn't actually change.
         expect(oldJsonModified, equals(oldJson.lastModifiedSync()));
       }), completes);
     });
   });
 }