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Refactor and extend UsageTimeLimitProcessor tests

This cl simplifies how the Time Limit policy is created on the unit
tests. It also adds a few tests cases that were not being covered and
that we have prevously found bugs on.

Bug: 902364
Change-Id: I1a2a5f9288740c0fa51dd5ccaabafd39432ba1d6
Reviewed-on: https://chromium-review.googlesource.com/c/1320269Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Henrique Grandinetti <hgrandinetti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606482}