Merge changes I9d6dde2c,I38bfcba5

* changes:
  logd: separate LogStatistics from LogBuffer
  logd: remove LogFindWorst
tree: d89e28f5418f0c72cd9addf688a6bbbdf34a2875
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/