benchmark.mojo: add time_between measurement type.

benchmark.mojo: Add time_between measurement type.

This allows us to define benchmarks that are in control of their time
origin.

R=qsr@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/9d5995ef18998fc32d157acdb95981918a1e8171

[ppi, 2015-10-01 09:48:43]

Hi Ben,

ptal.

[qsr, 2015-10-01 10:52:45]

LGTM with nits.

https://codereview.chromium.org/1380023005/diff/1/apps/benchmark/measurements.cc
File apps/benchmark/measurements.cc (right):

https://codereview.chromium.org/1380023005/diff/1/apps/benchmark/measurements...
apps/benchmark/measurements.cc:57: base::TimeTicks result;
What about initializing this with TimeTicks::Max() and not doing the if (found)
in the loop?

[ppi, 2015-10-01 12:42:48]

https://codereview.chromium.org/1380023005/diff/1/apps/benchmark/measurements.cc
File apps/benchmark/measurements.cc (right):

https://codereview.chromium.org/1380023005/diff/1/apps/benchmark/measurements...
apps/benchmark/measurements.cc:57: base::TimeTicks result;
On 2015/10/01 10:52:45, qsr wrote:
> What about initializing this with TimeTicks::Max() and not doing the if
(found)
> in the loop?

I wish, but there is no TimeTicks::Max(), only TimeDelta::Max().

[ppi, 2015-10-01 12:48:00]

Committed patchset #2 (id:20001) manually as
9d5995ef18998fc32d157acdb95981918a1e8171 (presubmit successful).