textarea does not honour autosize when initial value is set via ngModel

[ghost]

Bug, feature request, or proposal:

When I have a textarea with "mdTextareaAutosize" and a bound "ngModel", the textarea doesn't seem to size to the initial data. Once you change anything inside the textarea, it will start autosizing.

What is the expected behavior?

When page loads, textarea should be sized appropriate to data.

What is the current behavior?

When page loads, textarea is not sized.

What are the steps to reproduce?

http://plnkr.co/edit/D9ZmsmhRMNc2rjXkmVXv?p=preview

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

Applications that have dynamic data in text areas that needs to be autosized on load.

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

I have only tested in Chromium 58 on Linux. For Angular, it looks like your plunker template uses 4.1.3, but in the application I discovered it, we're using 4.0.0. Typescript is 2.2.1. Material is 2.0.0-beta.2 (although your plunker uses 2.0.0-beta.5).

[StevenRasmussen]

Just ran into this. Any thoughts on a workaround?

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