Tweak GraphicsStats#findRootPath to accept various valid locations

This effectively makes the path change in
Ibadb457d0c8f45ceca8153320ae5b896ae55bba2 optional instead of a
requirement.

Test: presubmits
Bug: 257123741
Change-Id: I20e00bd78eb86298cd203ea96fd3d36e140611fa
1 file changed