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The tab switch button won't show background changes after being hidden
and re-shown. This is to work-around that, by recreating it on each set
match that needs it. (Creating it is needed if the match type is a tab
switch and the tab switch button behavior was enabled.) This change
also restores the strategy of not creating a tab switch button unless
and until needed.

Bug: 825372
Change-Id: I0b808969ee5e9b91e3ca292fa929447da148d75c
Reviewed-on: https://chromium-review.googlesource.com/992356
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547834}