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The active tab is not yet reflected in the tab strip when
BrowserTabStripController is notified of the select change.

The index given to TabStrip to show as active will scroll the tabstrip
the minimum amount to make it visible.

Bug: 1116120

Change-Id: Iee5260960f30f06e84812261beaffb7317180efb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625910
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843806}