logd: add Chattiest LOG_TAG statistics

Report global LOG_TAG usage.

Test: gTest liblog-unit-tests, logd-unit-tests & logcat-unit-tests
Test: manual: inspect logcat -S results around 'Chattiest TAGs'
Bug: 37254265
Change-Id: I32473a1d9131c87e4fb7841d5cc0ea9cc14c63cd
2 files changed
tree: 7a48e527bb648899a3c644d27bae223b23adcc44
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/