Cobalt Platform Services API

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Maxim Budulev

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Jan 12, 2026, 12:39:15 PMJan 12
to cobalt-dev
Hi team,
I have questions about the Cobalt Platform Services API, as the documentation at https://developers.google.com/youtube/cobalt/docs/gen/cobalt/doc/platform_services appears outdated. It references files that no longer exist in trunk as well as 26.android/26.eap branches.

For the Android platform, I see initializeJavaBridge in CobaltActivity and an H5vccPlatformService class instantiated at startup, but no corresponding JavaScript objects like Android_H5vccPlatformService seem to be created or exposed.

Is this feature expected to work in the current state of the repo?
Where can I find details on the Platform Services refactoring (e.g., commit history, design docs, or discussions)?
What is the recommended way to implement JS API extensions for other platforms, such as Linux?
Any guidance, code examples, or pointers to relevant PRs/issues would be greatly appreciated!

Thanks,
Maxim B

Kaido Kert

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Jan 13, 2026, 4:08:25 PMJan 13
to Maxim Budulev, cobalt-dev
Hello,

This feature is not currently generally implemented in trunk - Android has a custom approach for now, but it's not the long term solution.
The implementation for other platforms is still being worked on - no details to share yet.

Also: cobalt.dev devsite is generally referring to the latest stable release, so all the docs on it are current for Cobalt 25.

Kaido


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