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
Merge "logd: Add minimum time bucket statistics"
Fix stack trace logging in RefBase.

This was broken about 5 months ago in change I78435ed49aa196a0efb45bf9b2d58b62c41737d3.
See: https://goto.google.com/jhtss

Change-Id: Icc32993552efed3015bc1b79a7bd872d7510e020
init: unused paramter warning messages

Change-Id: I1667371106be4b230ac3850e9819e4549eea2973
Merge "init: unused paramter warning messages"
Merge "Fix stack trace logging in RefBase."
logd: build breakage in user

build breakage in branch: git_klp-dev-gpl @ 1101951

Change-Id: I4c9681bf4c97368ec19f5a79fef134aba937f337
Merge "logd: build breakage in user"
auto-merger: merge in from aosp/master