Push the latency histograms to statsd

Cherry pick from master with no changes

Test: unit tests, verified atom logging with statsd_testdrive
Bug: 180584913

Change-Id: I0b8db72c0cb3b285177bbe402ce37639c468dbf3
Merged-In: I0b8db72c0cb3b285177bbe402ce37639c468dbf3
(cherry picked from commit a28ccaf3736c0cfb755b81f904d25c8563a36e11)
4 files changed