Added app breadcrumb support to StatsdListener.

This serves as a marker for gauge and value metrics so that statsd knows
when to dump metrics.

Bug: 141139812
Test: atest CollectorDeviceLibPlatformTest (updated)
Change-Id: Icb508573073a1c60a1d42ce152c997c525abea05
2 files changed
tree: 3297aad96f66aa23f28c9b2988688c7367fcce2e
  1. build/
  2. docs/
  3. emu_test/
  4. libraries/
  5. scripts/
  6. tests/
  7. utils/
  8. PREUPLOAD.cfg