The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1950bc2cd26e3e992f02bd8060c209e68dfbbbd9

commit 1950bc2cd26e3e992f02bd8060c209e68dfbbbd9
Author: Tommy Martino <tmartino@chromium.org>
Date: Tue Nov 20 16:58:17 2018

[Autofill Sync] Adding new row type

This CL introduces the frontend changes for an upcoming new row type in
the Autofill dropdown footer. Specifically, it:
* Adds a new frontend ID type.
* Checks against this frontend ID to the child view creation loop.
* Extracts the logic for choosing the layout type into a virtual method,
  replacing the anonymous helper and the optional override parameter
  used by the Footer rows to modify the layout type.
* Uses this new method to set the layout type in this new row type.
* Adds a frontend_id() convenience method to ItemView.

For more details see (Googlers only):
https://docs.google.com/document/d/18oV-_0QfoWM7rgp-suzDn4WspFNHRPKxI-4epHDQZIg/edit?usp=sharing

Bug: 905052
Change-Id: I370b3dc86a4fd7abc7dffa606acd2bd68213c4ba
Reviewed-on: https://chromium-review.googlesource.com/c/1334415
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609730}
[modify] https://crrev.com/1950bc2cd26e3e992f02bd8060c209e68dfbbbd9/chrome/browser/ui/autofill/autofill_popup_layout_model.cc
[modify] https://crrev.com/1950bc2cd26e3e992f02bd8060c209e68dfbbbd9/chrome/browser/ui/views/autofill/autofill_popup_view_native_views.cc
[modify] https://crrev.com/1950bc2cd26e3e992f02bd8060c209e68dfbbbd9/components/autofill/core/browser/popup_item_ids.h

Just checking: Is there anything left to do here for M72?

Thanks!

Everything's done, though I found one missing accessibility event (crbug.com/915715).

My guess would be that this is non-blocking; I can't prioritize a fix right now because I'm working on other, more severe accessibility bugs for non-Sync-Transport projects :) but hopefully I can slip a fix in for M73.