logd: test: statistics report chatty effective percentage

Add parsing to recognize optional chatty effective
percentage field as reported in the logger statistics.

Bug: 22855208
Change-Id: Id9c5e4a907ed0f9319beb9ddbfa27f4844bffc7d
1 file changed
tree: bac807c2bcb53828ec4b05f4cb4b7c06ae62b819
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/