| Index: tools/testing/dart/test_configurations.dart | 
| diff --git a/tools/testing/dart/test_configurations.dart b/tools/testing/dart/test_configurations.dart | 
| index 86169f4cbee4444094addc39aeaa1f98537ef643..e147a21cec8f333aa13b64de5c06e7513df127c0 100644 | 
| --- a/tools/testing/dart/test_configurations.dart | 
| +++ b/tools/testing/dart/test_configurations.dart | 
| @@ -62,7 +62,7 @@ Future testConfigurations(List<Map> configurations) async { | 
| var startTime = new DateTime.now(); | 
| // Extract global options from first configuration. | 
| var firstConf = configurations[0]; | 
| -  var maxProcesses = firstConf['tasks']; | 
| +  var maxProcesses = firstConf['tasks'] as int; | 
| var progressIndicator = firstConf['progress']; | 
| BuildbotProgressIndicator.stepName = firstConf['step_name']; | 
| var verbose = firstConf['verbose']; | 
|  |