Converted Observatory source-link & script-ref elements

runtime/observatory/lib/src/mocks/repositories/script.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 ScriptRepositoryMock implements M.ScriptRepository {
+  final Map<String, M.Script> scripts;
+
+  bool _invoked = false;
+  bool get invoked => _invoked;
+
+  ScriptRepositoryMock(this.scripts);
+
+  Future<M.Script> get(String id) async {
+    _invoked = true;
+    return scripts[id];
+  }
+}