mdInput - Bug: Placeholder does not float on ChangeDetectionStrategy.OnPush

[mbellezi]

Bug, feature request, or proposal:

Bug:
mdInput does not float the Placeholder when changes on a FormControl value associated with the input is done outside the main detection process of OnPush (on a @input change or event inside the component). Without the ChangeDetectionStrategy.OnPush, it works as expected.

What is the expected behavior?

mdInput should update the Placeholder float class of the control on a FormControl value change.

What is the current behavior?

It does not update the floating state of the Placeholder.

What are the steps to reproduce?

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

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

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

Angular 2.4.9, Material 2.0.0-beta.2, Chrome 56, MacOS

[fxck]

dupe of #3005

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