Input type datetime-local overlaps with placeholder

[TrevorBroderick1]

Bug, feature request, or proposal:

When the value string is empty, the placeholder of the md-input will overlap with the field.

What is the expected behavior?

The placeholder should stay above the field

What is the current behavior?

The placeholder overlaps with the field

What are the steps to reproduce?

Bind an empty string to md-input with type datetime-local.

http://plnkr.co/edit/p5vpltRGiy5SQXME2AAh?p=preview

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

It's broken.

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

Angular 2.1.2
Material Alpha 10, 9, 8 at least.
Windows 10
Chrome (datetime-local is only supported in chrome afaik).

Is there anything else we should know?

This was fixed for type="date" in #1238 but not for type="datetime-local".

[mmalerba]

This is fixed for md-input-container which will replace md-input

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