Add failing global error handling test.

tests/isolate/global_error_handler_test.dart

+// Copyright (c) 2013, 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:async';
+import 'dart:isolate';
+
+var firstFunction;
+var finishFunction;
+
+void runFunctions() {
+  try {
+    firstFunction();
+  } catch (e) {
+    new Timer(Duration.ZERO, finishFunction);
+    throw;
+  }
+}
+
+void startTest(SendPort finishPort, replyPort) {
+  firstFunction = () { throw new RuntimeError("ignore exception"); };
+  finishFunction = () { finishPort.send("done"); };
+  new Timer(Duration.ZERO, runFunctions);
+}
+
+runTest() {
+  port.receive(startTest);
+}
+
+bool globalErrorHandler(IsolateUnhandledException e) {
+  return e.source is RuntimeError && e.source.message == "ignore exception";
+}
+
+main() {
+  var port = new ReceivePort();
+  var timer;
+  SendPort otherIsolate = spawnFunction(runTest, globalErrorHandler);
+  otherIsolate.send(port.toSendPort());
+  port.receive((msg, replyPort) { port.close(); timer.cancel(); });
+  timer = new Timer(const Duration(seconds: 2), () { throw "failed"; });
+}