Add test to verify disabling animator pausing

This test was created to verify the behavior of a new method added to
AnimationHandler to change the default behavior of pausing animators
for background apps.

Bug: 232937493
Bug: 233391022
Test: This is the test for that other change
Change-Id: Ib932a3b911b32de172e087e501347e513faf91ce
Merged-In: Ib932a3b911b32de172e087e501347e513faf91ce
1 file changed