commit 2c3867d8d02fa19ecb75548e1610b05ef23291a8
author David Black <dmblack@google.com> Thu May 19 05:29:22 2022
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu May 19 05:29:22 2022
tree d8c8d04e5edcdec0a9741fac46eb08aa93f68b89
parent 30de8e19178e74e1db8214c046e1055d889d8dbd

personalization: Handle dedup key for Google Photos wallpapers.

Problem: Google Photos photos are uniquely identified by id but the same
photo in multiple albums will have a unique id per album. This makes it
impossible for us to determine whether a given photo from one album
refers to the same photo in another.

Solution: Google Photos photos are mapped to a dedup key that is the
same for a given photo across multiple albums. This makes it possible to
determine whether a given photo from one album refers to the same photo
in another.

Note: Backwards compatibility is important to consider due to cross
device sync. In this CL, a new attribute is synced for dedup key. Old
clients will not deserialize the new attribute and will therefore
continue to fall back to matching by id. If an old client sets a Google
Photos wallpaper, the new client will not deserialize a dedup key and
so will fall back to matching by id.

Before: http://shortn/_Q04RVVnAcK
After: http://shortn/_cR7BpNWHEy

Bug: b:232990402
Change-Id: I19db4415bd4b12f2bede5662a2e6f624264998fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3653296
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/main@{#1005120}