invalid MdSelect should highlight itself on parent form submitted

[natsid]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Expect md-select to show red (or 'warning' color) if it is invalid and its parent form is submitted.

What is the current behavior?

Currently the select does show warning color on touched and invalid, but not on parent form submitted and invalid.

What are the steps to reproduce?

See this plunk. Both the select and the input are 'required'. Click 'submit' and see that the select does not change its appearance like the input does.

What is the use-case or motivation for changing an existing behavior?

Would like to highlight errors on submit.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

all

Is there anything else we should know?

The MdSelect likely needs to inject an @optional NgForm/@optional FormGroupDirective in its constructor like MdInputContainer does so that it can keep track of its submitted state.

[natsid]

The select's 'required' asterisk also is not 'warning' color in all the same states as it is in the input:

When an input is focused (and valid or untouched), the asterisk is 'warning' even though everything else is 'primary'. When a select is focused, everything is 'primary' including the asterisk.

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