dart-lang/spark — pull request #576 by sunglim (2014-01-05 14:53:23+00:00)
Title: PolymerUI : Do nothing when outside of modal dialog clicked

When outside of modal dialog is clicked, `captureHandler` of spark-overlay is called.
To prevent closing modal dialog, make it do nothing except `e.stopImmediatePropagation()` and `e.preventDefault()`

Fix=https://github.com/dart-lang/spark/issues/528
Test=manual
review=@ussuri