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- There was a bug when the start and end times are inverted
  (i.e. start time is greater than end time as a time of day
   today).
- The schedule should refresh when device resumes from sleep
  since time will have changed while the device was suspended.

BUG=768902
TEST=Added new tests

Change-Id: I105085e36e9a68db97506e69286b471b8a738731
Reviewed-on: https://chromium-review.googlesource.com/821413Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523807}