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This CL decouples the addition of a tab completion block from the other
tab opening code in the BVC. This will allow the tab opening logic
(which is just tab model manipulation) to be moved out of the BVC.

Bug: 903338
Change-Id: Ibc7ba411c2cbec58dd11ac7cb65e2b9284eb811c
Reviewed-on: https://chromium-review.googlesource.com/c/1323558
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606825}