[pinpoint] Calculate distances between Changes.
We want to know the distances between the Changes so we can show them at the
proper distances on the chart. This lets users know how big the regression range
is, how far apart the regressions are, and how far along the Job is.
Change.Midpoint() and Commit.Midpoint() already do the legwork of downloading
DEPS files and calling out to gitiles_service.CommitRange(), so we can avoid
extra API calls by making Midpoint() provide the distance information as well.
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Total messages: 8 (5 generated)