Input placeholder animates when initialized with a value

[andrewseguin]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

When an input is initialized with a value, the input's placeholder should not animate to be above the value.

What is the current behavior?

The animation always triggers. Looks funny when the input is loaded, especially on pages where there are many inputs.

To see an example of this, go to the Examples tab at http://localhost:4200/components/component/slider

[kara]

Looks related to #2620

[frankspin89]

Gif to illustrate the problem

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