- Allow specifying of package: URIs for packageConfig and packageRoot when

tests/isolate/scenarios/automatic_resolution_spec/package_resolve_test.dart

-// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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.
 
 import 'dart:io';
 import 'dart:isolate';
 
 final PACKAGE_URI = "package:foo/bar.dart";
 final PACKAGE_PATH = "file:///no/such/directory/bar.dart";
 
 main([args, port]) async {
@@ skipping 33 matching lines @@
     var resolvedPkg = await Isolate.resolvePackageUri(Uri.parse(PACKAGE_URI));
     print("Spawned isolate's package root flag: $packageRootStr");
     print("Spawned isolate's package config flag: $packageConfigStr");
     print("Spawned isolate's loaded package config: $packageConfig");
     print("Spawned isolate's resolved package path: $resolvedPkg");
     port.send([packageConfig?.toString(), resolvedPkg?.toString()]);
   } catch (e, s) {
     port.send("$e\n$s\n");
   }
 }