Sidenav fails to emit FIRST onClose event

[jayoma]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

When page loads with sidenav in the opened state, the onClose output event should be emitted the very first (and every subsequent) time the sidenav is closed.

What is the current behavior?

The onClose output event is not emitted the FIRST time the sidenav is closed, but is emitted every time thereafter.

What are the steps to reproduce?

Plunker template: https://plnkr.co/edit/pAcVegKBaqKCsoRRQyko?p=preview

!! make sure to open developer tools to see the console logging I've added, before toggling sidenav !!

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

The event should fire reliably, whether it's the first or nth time the sidenav is toggled.

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

Angular: 4.4.1, Material: 2.0.0-beta.10, Chrome and IE at least

Is there anything else we should know?

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