fd6f27f790
Polymer uses it quite a bit, seems like Dart should expose it. It's primarily useful in Polymer because with HTMLImports it's easy to load content with different base URIs. BUG= R=jmesserly@google.com Review URL: https://codereview.chromium.org//235503007 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@35041 260f80e4-7a28-3924-810f-c04153c831b5