Converted observatory flag-list element

runtime/observatory/lib/src/mocks/repositories/flag.dart

Index: runtime/observatory/lib/src/mocks/repositories/flag.dart
diff --git a/runtime/observatory/lib/src/mocks/repositories/flag.dart b/runtime/observatory/lib/src/mocks/repositories/flag.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1c9c11dbd24eb841badabb8c8689408623dbc18c
--- /dev/null
+++ b/runtime/observatory/lib/src/mocks/repositories/flag.dart
@@ -0,0 +1,21 @@
+// Copyright (c) 2016, 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
+
+part of mocks;
+
+typedef Future<Iterable<M.Flag>> FlagsRepositoryMockCallback(M.VMRef vm);
+
+class FlagsRepositoryMock implements M.FlagsRepository {
+  final FlagsRepositoryMockCallback _list;
+
+  Future<Iterable<M.Flag>> list(M.VMRef vm) {
+    if (_list != null) {
+      return _list(vm);
+    }
+    return new Future.value(const []);
+  }
+
+  FlagsRepositoryMock({FlagsRepositoryMockCallback list})
+    : _list = list;
+}