Introduce TRACE_TAG_APEX_MANAGER and add timing to getActiveApexInfos

Timing for initialize cache path only. Currently ~3ms.
This will hopefully help catch regressions.

Bug: 148959827
Test: m, flash, boot, inspect logcat.
Change-Id: Ief83b8e1a6f0e58bca509527656c67b3465a4d19
2 files changed