a79067d9af
Port of https://github.com/Polymer/mdv/commit/9657f53fe38d2c87dd2b1f34398a41fafadc73b2 and https://github.com/Polymer/mdv/commit/3bbb5047e58e22dcef54aeedb431c12f1359766c R=justinfagnani@google.com Review URL: https://codereview.chromium.org//19989002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25329 260f80e4-7a28-3924-810f-c04153c831b5