Prevent more timeouts.

pkg/template_binding/test/utils.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.
 
 library template_binding.test.utils;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:observe/observe.dart';
+
+// Note: tests that import 'utils.dart' rely on the following line to make test
+// smaller for dart2js and prevent timeouts in the test bots.
+import 'package:observe/mirrors_used.dart';
 import 'package:template_binding/template_binding.dart';
 export 'package:observe/src/dirty_check.dart' show dirtyCheckZone;
 
 /// A small method to help readability. Used to cause the next "then" in a chain
 /// to happen in the next microtask:
 ///
 ///     future.then(endOfMicrotask).then(...)
 endOfMicrotask(_) => new Future.value();
 
 /// A small method to help readability. Used to cause the next "then" in a chain
@@ skipping 80 matching lines @@
 class NullTreeSanitizer implements NodeTreeSanitizer {
   void sanitizeTree(Node node) {}
 }
 
 unbindAll(node) {
   nodeBind(node).unbindAll();
   for (var child = node.firstChild; child != null; child = child.nextNode) {
     unbindAll(child);
   }
 }