Add StatsLog*Manager for logging.

Bug: 113043444

Verification: (19) is our event classifier number
11-05 11:24:28.188   932   994 I statsd  : { 1541445868000000000 766293363001 (19)0x10000->1[I] 0x20000->0[I] 0x30000->0[I] 0x40000->[S] 0x50000->1[I]  }

Change-Id: I75403837f9fa8e51efa012fb708bce7efc9c4488