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This change is behind the kReadLater flag and allows read later items to
sync cross device. This also adds a 'Reading List' option to
chrome://settings/syncSetup/advanced on Desktop when the flag is
enabled.

Bug: 1109316
Change-Id: I676a3ffaf565095eb02b95ea1d86577c60dc652f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504271
Commit-Queue: Caroline Rising <corising@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822228}