tree 72ae949a54f82913cbadba28c265524ca1ba04ff
parent adb6e7b60ba4da9f6b102e6ca9217ddce97fe328
author Erik Kline <ek@google.com> 1494575568 +0900
committer Erik Kline <ek@google.com> 1495068405 +0900

Expand logging capabilities of Tethering subsystem

Introduce a SharedLog that can be shared among all Tethering
components.  All log entries go to the same log, and each includes
its subsystem name.  Additionally, all entries emitted to the
system log shared the same tag, so can easily be watched.

More subsystems can inherit a SharedLog, but to minimize cherry-pick
conflicts we limit ourselves to these changes only.

Test: as follows
    - built
    - flashed
    - booted
    - log output observed via dumpsys
    - runtest frameworks-net passes
Bug: 32163131
Bug: 36988090
Bug: 38218697
Change-Id: I1229d4c55987402d84b0d4a2c8a595e0c829aa3e