Go back to the old ear-wiggling Android animation.

But keep the new code so we can easily test new animations when we have them.

This change includes tbao's de-interlace script, plus a one-liner that's
necessary to play the animation at the correct speed when there's no
progress bar showing. (This was always a bug, it's just way more noticeable
when your animation only has 7 frames.)

Bug: http://b/28316654
Bug: http://b/26548285
Change-Id: I32c601c352d6be235d1b44f14fca7e125defd77d