dart-lang/spark — pull request #566 by sunglim (2014-01-03 21:40:20+00:00)
Title: SparkButton: autofocus to child button tag

This patch make child button tag get focus when SparkButton get focus.
And `autofocus` is attribute only for input tag(even Chrome supports that to every tag). so I renamed `autofocus` to `focused`.

Fix : https://github.com/dart-lang/spark/issues/539

review @ussuri

Test = manual