Added additional args to Dartium launch

This makes launching Dartium from Sublime act much more like when Dartium is launched from the Eclipse editor. Side effects include getting rid of a bunch of potentially annoying startup and "first run" dialogs.
Thanks! Perhaps incorrectly, I thought Dartium should be passed args as an env variable. See here:

https://github.com/dart-lang/dart-sublime-bundle/blob/master/lib/sdk.py#L270

If these flags here should always be userd, perhaps we can move them over there.