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Per guidelines from UX, when the view is un-hovered, the auto-close
timer should resume with whatever time is left remaining.

Bug: b:140645793
Change-Id: I0370d2ac6f534a9e0b3ac8dd4486d6298fe48ce2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797344
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696106}