The specs to these animations are listed in this Direct tool:
https://direct.googleplex.com/#/group/Harmony

They are broken down with the following:

Small dialogs (320 px wide)
    Open
    Close
Medium dialogs (448 px wide)
    Open
    Close
Large dialogs (512 px wide)
    Open
    Close

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Available, but no owner or component? Please find a component, as no one will ever find this without one.