liblog: Add cpu utilization test

- followup to measure CPU utilization in liblog to
  ensure this issue gets caught before a regression
  passes into the labs. Threshold for failure is 1%.

(cherry picked from commit edadb2e7196040dd476e86581dc1c8e26449c00d)

BUG: 12457855
Change-Id: I40568a72aeef2f554b19ad55f3dd3c02bc023f24
1 file changed