Add extra information to FormatException.

R=floitsch@google.com

Review URL: https://codereview.chromium.org//389603002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/json_rpc_2@38181 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: d4d774df4b6524dcc2c0090866e1092092b9356e
  1. pkgs/