All apps transition work

-> Fix icons popping in
-> Fix issue 17259204
-> posting animation start and buildLayer to allow first
   frame to be ready. This becomes necessary with RevealAnimator
   on the render thread, since it can't use FirstFrameAnimatorHelper
   any longer.
-> adding a bit better transition for K, issue 17252683
-> updating a few assets

Change-Id: I0b193b4b3b511492a2fad6230cd91e3f0de634f0