The objective of this thesis is to implement an optional feature of the QUIC protocol - the Spin Bit - in the Chromium open-source browser, in order to make it possible to perform QUIC traffic measurements. QUIC is a network transport protocol, based on UDP, that avoids the use of traditional techniques to compute network measurements because its packets are encrypted. The Spin Bit is one of the few bits of the QUIC packet header that is left unencrypted, allowing network operators to deduce Round Trip Time of the QUIC connection based on the Spin Bit value. RFC 9000 describes the Spin Bit feature of the QUIC protocol as an optional feature and for this reason the majority of the state-of-the-art implementations of the QUIC protocol does not support it.