fca7d29b2c
extract template element from attribute templates. https://github.com/Polymer/mdv/commit/13741f22d94cec1d7ca115f023cf3a25b9245def Note: this is based on https://codereview.chromium.org/17552019/ (reorg mdv) R=justinfagnani@google.com Review URL: https://codereview.chromium.org//17706003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@24546 260f80e4-7a28-3924-810f-c04153c831b5