Add "checked" parameter to Isolate.spawnUri.

tests/isolate/checked_test.dart

+// Copyright (c) 2014, 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:isolate";
+import "dart:async";
+import "package:expect/expect.dart";
+import "package:async_helper/async_helper.dart";
+
+void main([args, message]) {
+  bool isChecked = false;
+  assert((isChecked = true));
+
+  if (isChecked) return;  // Skip this test in checked mode.
+
+  if (message != null) return isolateMain(message);
+
+  var responses = {};
+  var port = new RawReceivePort();
+  port.handler = (pair) {
+    responses[pair[0]] = pair[1];
+    if (responses.length == 3) {
+      port.close();
+      Expect.isTrue(responses[true], "true @ $isChecked");
+      Expect.isTrue(responses[false], "false @ $isChecked");
+      Expect.isTrue(responses[null], "null @ $isChecked");
+    }
+  };
+  test(checked) {
+    Isolate.spawnUri(Uri.parse("checked_test.dart"), [],
+                     [checked, isChecked, port.sendPort],
+                     checked: checked);
+  }
+  test(true);
+  test(false);
+  test(null);
+}
+
+
+void isolateMain(args) {
+  var checkedFlag = args[0];
+  var parentIsChecked = args[1];
+  var responsePort = args[2];
+  bool isChecked = false;
+  assert((isChecked = true));
+  bool expected = checkedFlag;
+  if (checkedFlag == null) expected = parentIsChecked;
+  responsePort.send([checkedFlag, expected == isChecked]);
+}