Be sure to use the UIControl-specific accessibility attributes for this (https://developer.apple.com/documentation/uikit/uicontrol?language=objc#overview).

Please add the user story label here

Any update Ed?

There are some technical barriers related to VoiceOver that I has prevented this story from completion. I am putting this work aside for now, given it is not high priority. I have filed a radar, and will work on this in Q2. 

The NextAction date has arrived: 2018-03-28

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5f663172fed2b0f1123717ca96bdec410f1c72ad

commit 5f663172fed2b0f1123717ca96bdec410f1c72ad
Author: edchin <edchin@chromium.org>
Date: Fri Mar 30 22:26:30 2018

[ios] Accessibility for tab grid page control

This is an initial CL for accessibility for the tab grid page control.

This CL:
- Sets tappable targets for each page when VoiceOver is enabled.
- Reads the title for each page (e.g., "Incognito Tabs")
- Sets unique accessibility identifiers for automated testing.

A future CL may consider/implement the following:
- Give a hint that there are 3 pages.
- Read the number of tabs in that page.

Bug:  822021 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ia3ad43eb05bb71391eb74e3fd017059177686ffe
Reviewed-on: https://chromium-review.googlesource.com/988817
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547289}
[modify] https://crrev.com/5f663172fed2b0f1123717ca96bdec410f1c72ad/ios/chrome/browser/ui/tab_grid/tab_grid_constants.h
[modify] https://crrev.com/5f663172fed2b0f1123717ca96bdec410f1c72ad/ios/chrome/browser/ui/tab_grid/tab_grid_constants.mm
[modify] https://crrev.com/5f663172fed2b0f1123717ca96bdec410f1c72ad/ios/chrome/browser/ui/tab_grid/tab_grid_page_control.mm

Any remaining considerations for accessibility for the page control can be handled in the  crbug.com/818442 . Marking this as completed.