tree b83f8ca1375562f3676ff0d940066c73e99bf1c6
parent d1022533e298b784f797fb5d7a617d7252eb3294
author Ian Lake <ilake@google.com> 1565986940 -0700
committer Ian Lake <ilake@google.com> 1566950000 -0700

Add skeleton for FragmentStateManager

Store a HashMap of mWho to FragmentStateManager
instances. This serves as the minimal starting
point for moving logic that interacts with a
single Fragment from FragmentManager into
FragmentStateManager.

Test: existing tests pass, new FragmentStateManagerTest
BUG: 139536619
Change-Id: Ifaea272a3202e918143f65245fb98157ad971827