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Entry animation: Translate up from offscreen.
Exit animation: Fade out.

See bug for demo.

Bug: b:139199754
Change-Id: Ib32f3bf0eaf19577cd1da2e9e28285a4d96bec53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769841Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#690907}