Skip to end for 0-duration animation

Repeating a 0-duration animation makes no sense. In the case of
battery saver mode, all animators are set to 0 duration, and
repeating the 0 duration animations not only waste battery power
but also potentially produce flickers on screen. In this CL,
0-duration animations are skipped to the end, regardless their
repeat count.

Bug: 25451472
Change-Id: I20f9dc2f0ff9c027782a8363ff4cf4a4d390736c