Merge changes I2a073293,Ia55ef8b9,I79a385fc

* changes:
  logd: continue search out-of-order entries timestamp tail
  logd: drop mSequence from LogBufferElement
  logd: ensure LogBufferElement mSequence is monotonic
tree: 8354f1e9075a073b8564f30f2d00ac93986ff394
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/