mdTextareaAutosize cuts off text on init

[JacobBrandt]

Bug, feature request, or proposal:

bug

What is the expected behavior?

All text should be visible in textarea that uses mdTextareaAutosize

What is the current behavior?

Lines missing in textarea

What are the steps to reproduce?

Provide a multiline default value for the textarea
http://plnkr.co/edit/SVMcC9IhIagP0xg99USQ?p=preview

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

It's a bug

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

all versions

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