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process from the renderer, all the way through to
OfflineItemsCollector, so that it can be used in notifications.
Also persist it using DataManager.

Additionally, a unit test has been added under browser_tests.

Bug: 813564
Change-Id: I8953deb9a7b19ed6cdab16806e79ffad98186256
Reviewed-on: https://chromium-review.googlesource.com/956183
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543354}