logd: Add minimum time bucket statistics

* Only enabled for dev builds because halves performance.
- Used to establish if /proc/sys/net/unix/max_dgram_qlen
  is appropriate for the platform
  (see logd/LogStatistics.cpp comments)
- enabled if logd.dgram_qlen.statistics is not zero/empty

Change-Id: Ib8ecfeb75b6f0f954c099a6b1032b8afb5efcbd4
5 files changed
tree: 57c514b89da74a3e94f077c95eee349df28f3f43
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/