Chris Wren 1488055804 revise the reader semantics
checkpoint modifies the underlying log rather than reading timestamps.
reset replays without going back to the underlying log.
add a test

Bug: 32982362
Test: runtest --path frameworks/base/core/tests/coretests/src/android/metrics
Change-Id: I381b203a1c24fcd098d7df4d9d0a50bd8aaa1309
2017-03-18 09:13:10 -04:00
..
2017-03-18 09:13:10 -04:00