commit 5836379b2114f47c53485b42ab157104c29b2c4e
author Mark Salyzyn <salyzyn@google.com> Mon Apr 17 12:46:12 2017 -0700
committer Mark Salyzyn <salyzyn@google.com> Mon Apr 17 15:10:26 2017 -0700
tree 7a1728529511862d750700e7cfdd1a16079f70e7
parent ffa38cfc1ea33de4ddddb291cc70cc507506b758

logd: regression in handling watermark boundary.

Deal with a regression introduced in commit
5a34d6ea43d28f3b5d27bf6dd5b9fa31ec033531 (logd: drop mSequence from
LogBufferElement) where log_time was compared against nsec() time
miscalculating the watermark boundary.  When dealing with logcat
-t/-T, or any tail reading, add a margin to prune to back off by a
period of 3 seconds (pruneMargin).

Test: gTest liblog-unit-tests logcat-unit-tests and logd-unit-tests
Bug: 37378309
Change-Id: I72ea858e4e7b5fa91741ea84c40d2e7c3c4aa031