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We have to regenerate ideal bounds when it's updated even when
it's animating.

Bug: 587688
Change-Id: I238808c6242734e1c3749a6dd7bd624f6a8a3bac
Test: TabStripBrowserTest.ActiveTabWidthWhenTabsAreTiny
Reviewed-on: https://chromium-review.googlesource.com/958382
Commit-Queue: SangWoo Ko <sangwoo108@gmail.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546007}