Properly check that usages are in the correct time range.

In addition to passing the time range to the API that returns the
usages, we also have to check that the returned usages are within the
time period.  Not doing this caused users of this API to show
incorrect results.

Test: See that Settings and PermissionsController have the same values
in their bar charts.

Change-Id: I5f39881dc8df04f9c954fb4b1102737fdd6aad6d