Fix a few issues with non-resizable info activity

- If stack doesn't have focus, we execute TASK_TO_FRONT transition.
Set the correct animation for this transition type.
- Make sure to execute app transition when we are finishing an
activity that isn't resumed.
- Correctly set mAnimatingExit for the case if the activity is
already paused.

Bug: 27327287
Bug: 27154882
Change-Id: I253938727ba0eea76ebadba242315bd2d305d0b4