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This CL does the job similar to https://crrev.com/c/1996268 but
particularly for display centering alignment. It ensures that the
active window is animated to the final icon bounds when the scrollable
shelf follows the display centering alignment.

Bug: 1030819
Change-Id: Idd81ef831e427a2f6328720193d8eb1585c0d77d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015404Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734284}