Added '--package-root' to http_server.dart.

tools/testing/dart/http_server.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.
 
 library http_server;
 
 import 'dart:io';
 import 'dart:isolate';
 import 'test_suite.dart';  // For TestUtils.
 // TODO(efortuna): Rewrite to not use the args library and simply take an
 // expected number of arguments, so test.dart doesn't rely on the args library?
 // See discussion on https://codereview.chromium.org/11931025/.
 import 'vendored_pkg/args/args.dart';
 
 main() {
   /** Convenience method for local testing. */
   var parser = new ArgParser();
   parser.addOption('port', abbr: 'p',
       help: 'The main server port we wish to respond to requests.',
       defaultsTo: '0');
   parser.addOption('crossOriginPort', abbr: 'c',
       help: 'A different port that accepts request from the main server port.',
       defaultsTo: '0');
   parser.addOption('mode', abbr: 'm', help: 'Testing mode.',

[ahe, 2013/02/01 10:28:59]

Unused option.

       defaultsTo: 'release');
   parser.addOption('arch', abbr: 'a', help: 'Testing architecture.',
       defaultsTo: 'ia32');

[ahe, 2013/02/01 10:28:59]

Unused option.

   parser.addFlag('help', abbr: 'h', negatable: false,
       help: 'Print this usage information.');
+  parser.addOption('package-root', help: 'The package root to use.');
   var args = parser.parse(new Options().arguments);
   if (args['help']) {
     print(parser.getUsage());
   } else {
     // Pretend we're running test.dart so that TestUtils doesn't get confused
     // about the "current directory." This is only used if we're trying to run
     // this file independently for local testing.
     TestUtils.testScriptPath = new Path(new Options().script)
         .directoryPath
         .join(new Path('../../test.dart'))
         .canonicalize()
         .toNativePath();
-    TestingServerRunner.setPackageRootDir({'mode': args['mode'],
-        'arch': args['arch'], 'system': Platform.operatingSystem,
-        'build_directory': ''});
-
+    TestingServerRunner._packageRootDir = new Path(args['package-root']);
     TestingServerRunner.startHttpServer('127.0.0.1',
         port: int.parse(args['port']));
     print('Server listening on port '
           '${TestingServerRunner.serverList[0].port}.');
     TestingServerRunner.startHttpServer('127.0.0.1',
         allowedPort: TestingServerRunner.serverList[0].port, port:
         int.parse(args['crossOriginPort']));
     print(
         'Server listening on port ${TestingServerRunner.serverList[1].port}.');
   }
@@ skipping 62 matching lines @@
             resp.outputStream.close();
           } catch (e) {
             if (e is StreamException) {
               print('Test http_server error closing the response stream: $e');
             } else {
               throw e;
             }
           }
         }
       });
-
     };
 
     // Echos back the contents of the request as the response data.
     httpServer.addRequestHandler((req) => req.path == "/echo", (request, resp) {
       resp.headers.set("Access-Control-Allow-Origin", "*");
 
       request.inputStream.pipe(resp.outputStream);
     });
 
     httpServer.listen(host, port);
     serverList.add(httpServer);
   }
 
   static terminateHttpServers() {
     for (var server in serverList) server.close();
   }
 }