Wait until AllSetActivity.onResume to start the background animation

The background animation was originally getting started through AllsetActivity.onCreate, which is a lot of work to put on the main thread during the launch animation. The animation will now instead start onResume through AllSetActivity.maybeResumeOrPauseBackgroundAnimation

Flag: EXEMPT bug fix
Fixes: 380392303
Test: started AllSetActivity locally and checked that the animation still starts
Change-Id: I201428dd9e7b754e9ab3199432d0754f2529e6c9
1 file changed