Implement stats logging for Compatibility API.

Add a new atom and log from both the app process API and the system server API
Bug: 136794938
Bug: 138378110
Test: statsd_testdrive 228

Change-Id: I80f07d0beb30c779c4bce70bebf2bb4ab22f6bfe
Merged-In: I80f07d0beb30c779c4bce70bebf2bb4ab22f6bfe