Converted Observatory refs elements

runtime/observatory/tests/observatory_ui/mocks/objects/library.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 LibraryRefMock implements M.LibraryRef {
   final String id;
   final String name;
   final String uri;
   const LibraryRefMock({this.id, this.name, this.uri});
 }
 
 class LibraryMock implements M.Library {
   final String id;
   final String name;
+  final M.ClassRef clazz;
+  final int size;
   final String uri;
   final bool debuggable;
   final Iterable<M.ScriptRef> scripts;
   final Iterable<M.ClassRef> classes;
-  const LibraryMock({this.id, this.name, this.uri, this.debuggable,
-      this.scripts: const [], this.classes: const []});
+  const LibraryMock({this.id, this.name, this.clazz, this.size, this.uri,
+                     this.debuggable, this.scripts: const [],
+                     this.classes: const []});
 }