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This CL animates the toggle slider for the alt-tab mode toggle slider.

Test: manual
Bug: 1157087
Change-Id: Ide73ce93aa0238c8927411cdf4489f7581a22d31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638153
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845419}