Version 0.2.4.0

svn merge -r 14662:15013 https://dart.googlecode.com/svn/branches/bleeding_edge trunk
+ cherry picks: 15023, 15026

git-svn-id: http://dart.googlecode.com/svn/trunk@15029 260f80e4-7a28-3924-810f-c04153c831b5