Fix issues with delayed transitions

Previously, there were two distinct problems with how delayed
transitions were being run:
- there would be a delay between the transition being put into
a preDrawListener (to be kicked off when that listener fired) and
being removed from the pending list. This allowed another delayed
transition to be run in parallel, which would cause conflicting/
clobbering issues with transition values on the same objects.
- there would be an extra frame delay in some cases due to how/when the
delayed transition would be started. Specfically, we would postOnAnimation()
to call a method that would then add the onPreDraw listener. This two-step
forwarding caused issues noted above.

The fix is to simply add the transition to the preDrawListener immediately, removing
the two-step problem, and also ensuring that the transition is only removed
from the pending list when it is actually started, which prevents other transitions
from starting in the meantime.

Also, added more debug logging to help chase future issues with transitions.

Change-Id: Ie2ff8e73d29f342512842e9641bd8d605e74544c