Add new atom to log userspace reboot performance

A first stab at the atom to log.
Actual logic to log will be in the follow up CL.

Test: builds
Bug: 148767783
Change-Id: Id3f81ced73ea708f1dcfbcfd66f554e8daed8ccc
Merged-In: Id3f81ced73ea708f1dcfbcfd66f554e8daed8ccc
(cherry picked from commit dd960593b17a44dd43e980e7b36126b6982fd6b7)
1 file changed
tree: 2e49933fc21325195c35ffab4f2eced6498398aa
  1. stats/