Converted Observatory object-common element

runtime/observatory/tests/observatory_ui/mocks/repositories/retained_size.dart

Index: runtime/observatory/tests/observatory_ui/mocks/repositories/retained_size.dart
diff --git a/runtime/observatory/tests/observatory_ui/mocks/repositories/retained_size.dart b/runtime/observatory/tests/observatory_ui/mocks/repositories/retained_size.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9f56299a6dadda4382940c0dc4712a5e2fe2843c
--- /dev/null
+++ b/runtime/observatory/tests/observatory_ui/mocks/repositories/retained_size.dart
@@ -0,0 +1,24 @@
+// 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<M.Guarded<M.Instance>>
+        RetainedSizeRepositoryMockGetter(M.IsolateRef i, String id);
+
+class RetainedSizeRepositoryMock implements M.RetainedSizeRepository {
+  final RetainedSizeRepositoryMockGetter _getter;
+
+  Future<M.Guarded<M.Instance>> get(M.IsolateRef i, String id) {
+    if (_getter != null) {
+      return _getter(i, id);
+    }
+    return new Future.value(
+      new GuardedMock<M.Instance>.fromSentinel(new SentinelMock())
+    );
+  }
+
+  RetainedSizeRepositoryMock({RetainedSizeRepositoryMockGetter getter})
+    : _getter = getter;
+}