Correct monotonic times before use.
Correct monotonic times before use.

The monotonic times are time.Durations, which need to be adjusted before
they can be used as Roughtime UTC milliseconds.

Change-Id: I2bf8a7f6067b3e522350c47a1cb1d13f63b70b32

fuchsia-mirror/third_party-roughtime,fuchsia-mirror/third_party-roughtime,fuchsia-mirror/third_party-roughtime,fuchsia-mirror/third_party-roughtime