- switches polymer to use a messages type
- autogenerates an HTML page from the message list.
- use these messages on polymer transformers
- moves build_logger to code_Transformers, so we can also use this in other packages.
Still pending to do more, for example, find a permanent location and URI scheme for messages
so we can show them on the command-line, improve the UI to tak advantage of clustering, etc.
But I think it's good enough to get it in and iterate afterwards
R=jakemac@google.com, kathyw@google.com
Review URL: https://codereview.chromium.org//513023002
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@39884 260f80e4-7a28-3924-810f-c04153c831b5
sigmund@google.com