mat-slide-toggle doesn't change appearance when focused with keyboard

[mertdeg2]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

mat-slide-toggle is highlighted when user tabs into the component

What is the current behavior?

mat-slide-toggle doesn't change its appearance when focused with keyboard

What are the steps to reproduce?

Press "Tab" key until the keyboard focus is on mat-slide-toggle

http://plnkr.co/edit/o077B6uEiiIgkC0S06dd?p=preview

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