Add folder UI animation.

Test: manual

Fixing b/144948355. The entire launcher was panning up when the user
would try to edit a folder name if that folder's name field would have
otherwise been obscured by the keyboard. This had the effect of
obscuring the smartspace. Added an animation to the folder UI to bring
it above the keyboard during text editing.

Change-Id: I0f95aae27fc7426f1025135ea6d4fa142a21cf43