fix(animations): implement getPosition in browser animation builder

[mhevery]

Accidently closed #28264 re-opening it here.

Forward getPosition to animation_group_player.

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Issue Number: N/A

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[cgatian]

We have been waiting for this! This is the first contribution from the Hyland team. We are going celebrate when this is merged.

Good job @literalpie

[literalpie]

@googlebot I consent.

[mhevery]

presubmit

[literalpie]

I see that the presubmit check is failing. Is there anything I can do to help?

[mhevery]

MERGE_ASSISTANCE: This PR has already been approved in #28264 (and accidently closed) This will be merged without further approval.

[literalpie]

@mhevery was this unintentionally closed again?

[petebacondarwin]

@literalpie - no it was merged by our tooling which github doesn't understand, so we close the PR directly.

[literalpie]

Cool, thank you!

[JoostK]

As a matter of fact this has already been released in 11.0.4 :)

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