add an error dialog
Merge pull request #790 from umop/umop-polymer-menu_separator

Polymer menu separator
Merge pull request #791 from dart-lang/devoncarew_error_dialog

add an error dialog
focused ==> autofocus
Merge pull request #799 from dart-lang/devoncarew_dialogs

focused ==> autofocus
Fixed focus issues (explicitly setting focus on show of SparkPolymerDialog)
TESTING: Tracing out focus events, etc
Revert "TESTING: Tracing out focus events, etc"

This reverts commit b51d8d6f91645a34c6c581665afd32df4ea44371.
bootjack safe way of skipping focus fix
Removed focus / context menu fix (bootjack or not)
Review changes