sdong 6d6305dd7d Perf Context to report DB mutex waiting time
Summary: Add counters in perf context to allow users to figure out how time spent on waiting for DB mutex

Test Plan: Add a test and run it.

Reviewers: yhchiang, rven, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D33177
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