Review Request 20585: Added 'time()' method to metrics::Timer to allow timing of Futures.

[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 PRE-CREATION 
  3rdparty/libprocess/src/tests/metrics_tests.cpp 
abe1588c931b45a09294812974788aa74de44dd4 

Diff: https://reviews.apache.org/r/20585/diff/


Testing
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added test, make check.


Thanks,

Dominic Hamon