Review Request 20593: Added method to metrics::Timer to allow timing of async operations.

[Dominic Hamon]

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Review request for mesos and Ben Mahler.


Repository: mesos-git


Description
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see summary


Diffs
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  3rdparty/libprocess/include/process/metrics/timer.hpp 
c8e1d91bdc39fb0702bc761e98807abdade4996d 
  3rdparty/libprocess/src/tests/metrics_tests.cpp 
6f3795b33b92dd0621867e274649f8b9667ba538 

Diff: https://reviews.apache.org/r/20593/diff/


Testing
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make check


Thanks,

Dominic Hamon