Reapply "[vm] Prevent non-fatal errors from causing timers to be dropped."

tests/isolate/timer_multiple_isolates_test.dart

Index: tests/isolate/timer_multiple_isolates_test.dart
diff --git a/tests/isolate/timer_multiple_isolates_test.dart b/tests/isolate/timer_multiple_isolates_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..68a5006ec9e4bfb21d4bcfc84f4a923686f36b9e
--- /dev/null
+++ b/tests/isolate/timer_multiple_isolates_test.dart
@@ -0,0 +1,42 @@
+// Copyright (c) 2017, 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 timer_multiple_isolates_test;
+
+import 'dart:isolate';
+import 'dart:async';
+
+child(msg) {
+  var i = msg[0];
+  var reponsePort = msg[1];
+  print("Starting child $i");
+
+  // Keep this isolate running to prevent its shutdown from touching the event
+  // handler.
+  new RawReceivePort();
+
+  // Try to get separate wakeups for each isolate.
+  new Timer(new Duration(milliseconds: 100 * (i + 1)), () {
+    print("Timer fired $i");
+    reponsePort.send(null);
+  });
+}
+
+main() {
+  var port;
+  var replies = 0;
+  var n = 3;
+  port = new RawReceivePort((reply) {
+    replies++;
+    print("Got reply $replies");
+    if (replies == n) {
+      print("Done");
+      port.close();
+    }
+  });
+
+  for (var i = 0; i < n; i++) {
+    Isolate.spawn(child, [i, port.sendPort]);
+  }
+}