Add support for package spec to testing HttpServer.

tools/testing/dart/test_configurations.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 test_configurations;
 
 import "dart:async";
 import 'dart:io';
 import "dart:math" as math;
 
@@ skipping 114 matching lines @@
   }
   for (var conf in configurations) {
     Map<String, RegExp> selectors = conf['selectors'];
     var useContentSecurityPolicy = conf['csp'];
     if (!listTests && runningBrowserTests) {
       // Start global http servers that serve the entire dart repo.
       // The http server is available on window.location.port, and a second
       // server for cross-domain tests can be found by calling
       // getCrossOriginPortNumber().
       var servers = new TestingServers(
-          new Path(TestUtils.buildDir(conf)),
+          TestUtils.buildDir(conf),
           useContentSecurityPolicy,
           conf['runtime'],
           null,
-          conf['package_root']);
+          conf['package_root'],
+          conf['packages']);
       serverFutures.add(servers.startServers(conf['local_ip'],
           port: conf['test_server_port'],
           crossOriginPort: conf['test_server_cross_origin_port']));
       conf['_servers_'] = servers;
       if (verbose) {
         serverFutures.last.then((_) {
           var commandline = servers.httpServerCommandline();
           print('Started HttpServers: $commandline');
         });
       }
@@ skipping 154 matching lines @@
       maxBrowserProcesses,
       startTime,
       testSuites,
       eventListener,
       allTestsFinished,
       verbose,
       recordingPath,
       recordingOutputPath,
       adbDevicePool);
 }