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Add a new GetRegistrationTask to be used by BackgroundFetchDataManager
when the persistent storage flag is enabled.

Adds the origin to the proto stored in the database and check it
matches when retrieving a registration, otherwise trigger a storage
error.

Make BackgroundFetchDataManagerTest parameterized by persistence, which
turns on the command line flag. Now all tests run (and pass) with or
without persistence although the Cleanup test doesn't test much yet
since there's no way yet to interact with a non-active fetch.

Bug: 757760
Change-Id: I3aa29e17f9112f282f5672366e52522e549f32d0
Reviewed-on: https://chromium-review.googlesource.com/758762Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515498}