This adds IRemoteTransition interface for other processes (like
launcher) to register for playing transition animations.
Then there are 2 supported ways to "register":
1. Is to attach an IRemoteTransition to ActivityOptions. To
support this pathway, requestStartTransition now takes a
TransitionRequest object which can contain whatever info
is needed at the time. One piece of that is the passed-in
IRemoteTransition.
2. Is to register directly with shell (via systemuiproxy for
now) with a TransitionFilter. This filter allows shell
transitions to dispatch a transition to a remote without
need to make queries over binder.
This also hooks up launcher animations by converting the new
transition info to the old RemoteAnimationTargetCompat stuff.
Bug: 169035082
Test: launch app from launcher and observe the icon animation.
atest ShellTransitionTests
Change-Id: I8014a6f46cffda3a48a1a4ae101e2643078f4a14
30f3544f65