Add possibility to set the focus to a md-select

[Mario-Eis]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

A possibility to focus a md-select. like mdSelectViewChild.focus()
Input elements provide that feature by injecting the input element as a ViewChild and set the focus to it's native element. That doesn't seem possible for md-select.

What is the current behavior?

The only possibility I found to set the input focus to a md-select dynamically was
viewChild._element.nativeElement.focus();
That works so far, but seems to be quite a hack ;)

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

In my case I need to focus a md-select dynamically for a better user input flow.

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

4.2.3 / beta.6 / at least Chrome, Opera

Is there anything else we should know?

Maybe a common way to dynamically set an input focus to angular material elements would be a good idea.

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