| Index: runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart | 
| diff --git a/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart b/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart | 
| index c501e8a4646ce00d45eb73df9ff2eea71dd66038..1e325fb19fd9f51137a9c182e17028174c9b026d 100644 | 
| --- a/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart | 
| +++ b/runtime/observatory/tests/observatory_ui/mocks/objects/isolate.dart | 
| @@ -28,6 +28,10 @@ class IsolateMock implements M.Isolate { | 
| final M.DebugEvent pauseEvent; | 
| final M.LibraryRef rootLibrary; | 
| final M.FunctionRef entry; | 
| +  final Iterable<M.Thread> threads = null; | 
| +  final int zoneHighWatermark = 0; | 
| +  final int numZoneHandles = 0; | 
| +  final int numScopedHandles = 0; | 
|  | 
| const IsolateMock( | 
| {this.id: 'i-id', | 
|  |