I don't know if it is actually implemented, but note it could be either of the two endpoints that could cooperate to allow decryption - client (browser) or server.
It is possible that Google is not allowed to operate in India unless they transmit all the keys to the government somehow. If they are forced to share the private key used for Youtube's certificates, that would allow effective MITM, or entirely passive surveillance if a non-ephemeral key suite is used. Google could also be required to send them every ephemeral key.
