Move the implementation of AnimatedState into AnimatedStateImpl

This CL is a simple move of the implementation of AnimatedState into a
separate AnimatedStateImpl class. This is just meant to make the diff of
ag/27551958 easier to parse.

Bug: 290930950
Test: atest AnimatedSharedAsStateTest
Flag: com.android.systemui.scene_container
Change-Id: Ia7cec9773eb660a2a6b168f5b22a99018feafe3d
1 file changed