Looks like it is? https://www.chromium.org/developers/design-documents/sync https://www.chromium.org/developers/design-documents/sync And even if not, since th

Looks like it is? https://www.chromium.org/developers/design-documents/sync https://www.chromium.org/developers/design-documents/sync And even if not, since the client is OSS, it can be inferred.