As mentioned on our sync. I'll take a look at the VC logic needed to make this happen, we can later take a look at the cell styling 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b07ee78064fbc7bef5f4ba81e9068ef12f6eedfe

commit b07ee78064fbc7bef5f4ba81e9068ef12f6eedfe
Author: sczs <sczs@chromium.org>
Date: Tue Mar 20 18:41:32 2018

[ios] Creates TableViewSigninPromoItem

- Creates TableViewSigninPromoItem
- Creates TableViewSigninPromoCell, which contains a SigninPromoView.
- Adds a TableViewSigninPromoItem to RecentTabsTableVC.

Screenshot:
https://drive.google.com/open?id=1AEvY83bXQybiwPPHdO38fCbqOdrfXHha

Bug:  805164 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I483d94d3a59fbc9e773b6f2f3ef9f69fe6f23303
Reviewed-on: https://chromium-review.googlesource.com/963664
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544443}
[modify] https://crrev.com/b07ee78064fbc7bef5f4ba81e9068ef12f6eedfe/ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_table_view_controller.mm
[modify] https://crrev.com/b07ee78064fbc7bef5f4ba81e9068ef12f6eedfe/ios/chrome/browser/ui/table_view/cells/BUILD.gn
[add] https://crrev.com/b07ee78064fbc7bef5f4ba81e9068ef12f6eedfe/ios/chrome/browser/ui/table_view/cells/table_view_signin_promo_item.h
[add] https://crrev.com/b07ee78064fbc7bef5f4ba81e9068ef12f6eedfe/ios/chrome/browser/ui/table_view/cells/table_view_signin_promo_item.mm

Polish is still needed.

I thought there were a number of different promos.  Are those tracked separately, or are they all implemented using the same view?

They are implemented on the same view. By promos I mean the cell for when you're completely signed out and asks you to login, and the other one that says continue as XYZ@gmail.com. The view on that CL takes care of both.

All other "other devices" cases are just a block of text telling you to turn on sync or to let you know that remote sessions will appear there when there's none, and the Syncing animation.