Add black box test for scrolling stops when suspended

[sherryzy]

b/238885425

[codecov[bot]]

Codecov Report

Merging #1570 (8bef211) into main (a8bd2c3) will decrease coverage by 0.02%. Report is 13 commits behind head on main. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1570      +/-   ##
==========================================
- Coverage   57.57%   57.55%   -0.02%     
==========================================
  Files        1905     1905              
  Lines       94754    94764      +10     
==========================================
- Hits        54550    54541       -9     
- Misses      40204    40223      +19     

see 12 files with indirect coverage changes

[sherryzy]

This looks great—would you be able to confirm that it fails without #901 applied? (or with it reverted)

Well, it actually succeeds. Any suggestions how we can make it catch the issue better?