logd: better drop message merging

- Former algorithm anlo coalesced adjacent records
- New algorithm maintains a hash list of all drop
  records and coalesces them all.

Bug: 20334069
Bug: 20370119
Change-Id: Idc15ce31fc1087c2cfa39da60c62feade8b88761
1 file changed
tree: e12c2ea46205bb3309f5f1e58329033c4988d6b1
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/