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This is merely a heuristic for whether or not to create a tab group
based on the opener of the tab next to the current one.

Bug: 1128703
Change-Id: Iae0ae8db78be0bbe9be2fdacd143c70e1a0d49bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567818
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Connie Wan <connily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834915}