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Opening from an external link (target=_blank or window.open) eagerly creates a group, similar to ctrl+click on a regular link.

Opening with ctrl+forward/back does not eagerly create a group, but it adds the new tab to the same group as the source tab.

Bug: 1013532, 1013537
Change-Id: I5823f572f9727c810a67333091cc294df5ec65e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879762
Commit-Queue: Connie Wan <connily@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710077}