Add logging for BAL

Most are build-time strippable and defaulted to off. One is a warning
that would've enabled us to diagnose b/152621860. Expanded the already
existent log in case an activity is blocked.

Bug: 152621860
Test: Observe logcat
Change-Id: Ieee8079a827c4e353987094d7d6d6faec5856c20
3 files changed