Is there an existing issue for this?

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Use case

flutter/cocoon dashboard app uses the google_sign_in Flutter plugin for user authentication.

google_sign_in is powered by the Google Identity Services (GIS) SDK.

In an email titled [Action Advised] Join Google Identity Services Federated Credential Management (FedCM) Beta Program, the GIS team has just announced a new beta iteration of their SDK ¹, that is backed by a new API (FedCM), that will eventually replace (and enable the deprecation of) third-party cookies in browsers.

Proposal

Modify cocoon to opt-in into the FedCM beta linked above, to test how the google_sign_in plugin behaves before mass adoption.

From the email:

To join the Beta Program to start testing, simply add a boolean flag to enable FedCM when initializing Sign in with Google SDK (JavaScript).

Please review the developer site to understand the potential impact and if needed, plan for changes on your web applications.