GitLab

* Add function GetEndOfCurrent interval to obtain the last end of the
interval which contains the current time.
* Add function MaterializeIntervalsToLocalTimezone, which materializes
the given intervals to the current local timezone.
* Add function TimeIsInsideCrosSettingsIntervals, which checks if the
current time is inside the intervals set in cros settings. It then
returns the localized string of the end of the interval that contains
the current time.

This is a reland of CL:1132676 which fixes memory leaks that lead to a
revert (revert was CL:1172003).

BUG=chromium:852860
TEST=added unittests

Change-Id: I8ad01d4ab90d4e699e4b7377c24e4932513ebe1b
Reviewed-on: https://chromium-review.googlesource.com/1172128Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582892}