Merge changes I957c519b,Iaf4e389e,I92f8056b

* changes:
  logd: remove faulty optimization
  logd: don't store the map key in its value
  logd: use libbase logging
tree: 9b68a38b6fd92a3267116962c2f88727f4ce6792
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/