Add test coverage for LockdownVpnTracker.

Also add a comment to an existing test.

Bug: 173331190
Test: test-only change
Change-Id: I4211475f053f0cdf2b804132c52ce5205a772193
2 files changed
tree: 28279a8f5ec29725e669c94adbb2247c057e7360
  1. core/
  2. service/
  3. services/
  4. tests/
  5. OWNERS