Allow package: imports inside isolates

tests/standalone/package/package_isolate_test.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 package_isolate_test;
+
+import 'package:shared.dart' as shared;
+import 'dart:isolate';
+import '../../../pkg/unittest/unittest.dart';
+
+expectResponse() {
+  port.receive(expectAsync2((msg, r) {
+    expect('isolate', msg);
+    expect('main', shared.output);
+    port.close();
+  }));
+}
+
+void main() {
+  test("package in spawnFunction()", () {
+    expectResponse();
+    shared.output = 'main';
+    var sendPort = spawnFunction(isolate_main);
+    sendPort.send("sendPort", port.toSendPort());
+  });
+  
+  test("package in spawnUri() of sibling file", () {
+    expectResponse();
+    shared.output = 'main';
+    var sendPort = spawnUri('sibling_isolate.dart');
+    sendPort.send('sendPort', port.toSendPort());
+  });
+
+  test("package in spawnUri() of file in folder", () {
+    expectResponse();
+    shared.output = 'main';
+    var sendPort = spawnUri('test_folder/folder_isolate.dart');
+    sendPort.send('sendPort', port.toSendPort());
+  });
+}
+
+void isolate_main() {
+  shared.output = 'isolate';
+  port.receive((msg, replyTo) {
+    replyTo.send(shared.output);
+  });
+}