Make incremental tests time out faster.

dart/tests/try/web/incremental_compilation_update_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.
 
 library trydart.incremental_compilation_update_test;
 
 import 'dart:html';
 
 import 'dart:async' show
     Future;
 
 import 'package:async_helper/async_helper.dart' show
     asyncTest;
 
 import 'sandbox.dart' show
     appendIFrame,
     listener;
 
 import 'web_compiler_test_case.dart' show
     WebCompilerTestCase,
     WebInputProvider;
 
 import 'program_result.dart';
 
+const int TIMEOUT = 100;
+
 const List<List<ProgramResult>> tests = const <List<ProgramResult>>[
     // Basic hello-world test.
     const <ProgramResult>[
         const ProgramResult(
             "main() { print('Hello, World!'); }",
             const <String> ['Hello, World!']),
         const ProgramResult(
             "main() { print('Hello, Brave New World!'); }",
             const <String> ['Hello, Brave New World!']),
     ],
@@ skipping 161 matching lines @@
         int version = 2;
         return Future.forEach(programs.skip(1), (ProgramResult program) {
 
           status.append(new PreElement()..appendText(program.code));
 
           WebInputProvider inputProvider =
               test.incrementalCompiler.inputProvider;
           Uri uri = test.scriptUri.resolve('?v${version++}');
           inputProvider.cachedSources[uri] = new Future.value(program.code);
           Future future = test.incrementalCompiler.compileUpdates(
-              {test.scriptUri: uri}, logVerbose: print, logTime: print);
+              {test.scriptUri: uri}, logVerbose: logger, logTime: logger);
           return future.then((String update) {
             print({'update': update});
             iframe.contentWindow.postMessage(['apply-update', update], '*');
 
             return listener.expect(
                 program.messagesWith('iframe-dart-updated-main-done'));
           });
         });
       });
     });
   }).then((_) {
     status.style.color = 'limegreen';
 
     // Remove the iframe to work around a bug in test.dart.
     iframe.remove();
   });
 }
+
+void logger(x) {
+  print(x);
+  bool isCheckedMode = false;
+  assert(isCheckedMode = true);
+  int timeout = isCheckedMode ? TIMEOUT * 2 : TIMEOUT;
+  if (listener.elapsed > timeout) {
+    throw 'Test timed out.';
+  }
+}