Polishing the AllApps transition

-> separating HW layers during animation to be siblings
   instead of parent-child (was destroying parent layer
   on each frame)
-> Unifying material transition with pre-L, everything
   is the same, just missing the reveal.

Change-Id: I8f7d5e658c2d9298bea83ce8199cb35e6fc0d44e
7 files changed