logd: worst uid record watermark

Hold on to last worst uid watermark and bypass a spike to O(n*n*x)
(n=samples, x=number of spammers) wrt chatty trimming.

Bug: 23327476
Change-Id: I9f21ce95e969b67e576417a760f75c4d86acf364
2 files changed
tree: caa595ecc264752824803efd0bd75a649ada89f0
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/