logcat: Add --max-count option

This new option causes logcat to quit after it prints N messages.

Test: New unit test passes
Bug: 27706081
Change-Id: Ie52ddf300160a041e68a6bac0ae7ade68bb28a7c
2 files changed
tree: 779d358d45f6809eec803d4b1a32dc322354bf4e
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/