[AF Wallet] Create an integration test for empty updates

This CL adds a test for the common scenario that the sync server sends
an empty update for the wallet data model type. This should have no
impact on local data.

Bug: 853688
Change-Id: Ib9699c0c0f531c0608f470ab59111da68253e3c2
Reviewed-on: https://chromium-review.googlesource.com/1193885
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587063}
1 file changed