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Previously whenever a new tab was open programmatically the snapshot
wasn't updated, causing inconsistencies in the tab switcher. This CL
amends that by asking for a new snapshot in main controller, before the
action of opening a new tab takes place.

Bug: 1029482
Change-Id: I49c327b3891d91cc6bdf60de28c80770e23e893a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1981717
Auto-Submit: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727455}