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Since all the logic outside of the data.ndjson file is self-contained
in the client, we can make the client run offline and support add to
shelf.

Bug: 847599
Change-Id: Ic29237e994fd07f75006d1f2ef4402b835511341
Reviewed-on: https://chromium-review.googlesource.com/1145595Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Tiger Oakes <tigero@google.com>
Cr-Commit-Position: refs/heads/master@{#577547}