Add Zone support for Timers.

tests/lib/async/catch_errors12_test.dart

Index: tests/lib/async/catch_errors12_test.dart
diff --git a/tests/lib/async/catch_errors7_test.dart b/tests/lib/async/catch_errors12_test.dart
similarity index 62%
copy from tests/lib/async/catch_errors7_test.dart
copy to tests/lib/async/catch_errors12_test.dart
index 398a3c57e9c7e283b1e37532c6be75606a930e9f..59d9c6a400fd9a7dadf9ca7e0ea87767c92da28a 100644
--- a/tests/lib/async/catch_errors7_test.dart
+++ b/tests/lib/async/catch_errors12_test.dart
@@ -8,15 +8,18 @@ import 'dart:isolate';
 
 main() {
   // We keep a ReceivePort open until all tests are done. This way the VM will
-  // time out if the callbacks are not invoked.
+  // hang if the callbacks are not invoked and the test will time out.
   var port = new ReceivePort();
   var events = [];
-  // Test that asynchronous errors are caught.
+  // Tests that errors that have been delayed by several milliseconds with
+  // Timers are still caught by `catchErrors`.
   catchErrors(() {
     events.add("catch error entry");
-    new Future.error("future error");
-    new Future.error("future error2");
-    new Future.value(499).then((x) => throw x);
+    Timer.run(() { throw "timer error"; });
+    new Timer(const Duration(milliseconds: 100), () { throw "timer2 error"; });
+    new Future.value(499).then((x) {
+      new Timer(const Duration(milliseconds: 200), () { throw x; });
+    });
     throw "catch error";
   }).listen((x) {
       events.add(x);
@@ -26,8 +29,8 @@ main() {
             "catch error entry",
             "main exit",
             "catch error",
-            "future error",
-            "future error2",
+            "timer error",
+            "timer2 error",
             499,
           ],
           events);