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Change the transition animation duration to 500 ms.

Bug: b/162782654
Test: manual
Change-Id: Ic7ee30843bc04c4666a29e56ff859343acb29b73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337376Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794735}