[iOS] Add Tab Grid context menu actions

Bug: 1196953
Change-Id: Ib80ebf889af6cf1c84e0b3b9ac7deb433226ad0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2841164
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#874990}
GitOrigin-RevId: f32268180be17731109719dccab8b57488b5b07f
20 files changed