Converted Observatory nav-notify element

runtime/observatory/lib/src/mocks/objects/source_location.dart

+// 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;
+
+class SourceLocationMock implements M.SourceLocation {
+  final M.ScriptRef script;
+  final int tokenPos;
+  final int endTokenPos;
+  const SourceLocationMock({this.script, this.tokenPos, this.endTokenPos});
+}