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This patch depends on https://chromium-review.googlesource.com/c/chromium/src/+/1229234 which implemented a virtual accessibility view class.
I propose that we use the grid role for the table view and mark it readonly because in Views a table view is interactive like an ARIA grid.
On Windows it will be exposed as a list view control  and on Mac as a table view.
R=dmazzoni@chromium.org, ellyjones@chromium.org, sky@chromium.org, aleventhal@chromium.org

Bug: 811277
Change-Id: I9e02563f1220f300e7fd78dc4cbbf5ee5e585acb
Reviewed-on: https://chromium-review.googlesource.com/c/1363793
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625201}