Looking for NaN values in status bar animations.

We should probably set these values to 0 when we find them,
but first I want to catch this bug in the act before I paper
over it with defensive programming.

Also standardizing on use of isStarted() instead of
isRunning() on animators.

Bug: 7686690
Change-Id: I9f93c443784d2ed795d3e16ad9bb03811371497c