aaa45c7682
Add lib/json test based on tests/json/json_test.dart (is this used at all?). Review URL: https://codereview.chromium.org//14289002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@21538 260f80e4-7a28-3924-810f-c04153c831b5